Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7190d800b668c5…

MALICIOUS

PDF

114.1 KB Created: 2021-04-01 08:39:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b25910463d9cb3e593a85ee51afc5d45 SHA-1: ea98c0c1085e7ee15c152e4ea9927a3c2cdb0997 SHA-256: 4b7190d800b668c53d93ca179e307b13c5063ca751bb48eccc7b1782d05411d3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to other PDF documents, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9861

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://baarspo.ru/award?keyword=pediatric+neurological+disorders+pdf PDF link annotation
    • https://cdn.sqhk.co/bavisimupux/hgP8gjp/57017977747.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497110/normal_5fffec1d8a507.pdfIn PDF document text
    • https://cdn.sqhk.co/kitobanifamo/1hb3Hjg/playstation_emulator_for_android_tv.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/1xgeyoN/free_invitation_templates_printable_baby_showers.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/qWrrwhd/14044953440.pdfIn PDF document text
    • https://cdn.sqhk.co/rosivapixove/gpfvSjf/apakah_game_summoners_war_offline.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/gl9hpgg/strategy_consulting_salary_progression.pdfIn PDF document text
    • https://cdn.sqhk.co/xorakulenido/fMb7eic/fozeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_5fd8b9681fbdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500201/normal_5fd2380990ef4.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/jhe5bLo/9014983933.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/hehhjao/gangs_of_london_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/gfUgfgb/battlevoid_first_contact_hacked_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424013/normal_600069aa4a009.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467043/normal_606523656fe27.pdfIn PDF document text
    • https://cdn.sqhk.co/sepunaro/ihiiQoi/nick_basketball_stars_3_kbh.pdfIn PDF document text
    • https://cdn.sqhk.co/mesojofu/b1Iigig/odd_eyes_rebellion_dragon_anime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e384e8b-b583-4aef-9576-099fbca6a5ee/pioneer_vsx-820-k_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff8a8da-2cc7-4215-8a8a-201ce0c27a78/65426374222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0da82098-d759-495a-9e56-69f9910ee77f/flammable_storage_osha_requirements.pdfIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_ebc9dfe5422e4147a0b981ba1e228094.pdf?index=trueIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_9b181b951477434b9204da7b60fc2e25.pdf?index=trueIn PDF document text
    • https://587b455d-cc79-4428-8e80-a8b75ce23bca.filesusr.com/ugd/021ec8_94975237c43c4dcf8ac811e4ce14ee93.pdf?index=trueIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_1924d0e84eb047a3911bcfec96e3c011.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b9c9c8c-aac1-44ed-abc1-919509e7fb9c/xesemezudupijakix.pdfIn PDF document text
    • https://43466d02-873c-4564-b63c-f2f79aa6d38e.filesusr.com/ugd/fd64e8_aca37be671354f1fb992014719dbccb8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3182f76a-1f54-4891-9f89-cde8c4e38094/balzac_and_the_little_chinese_seamstress_movie_summary.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD5 5324 bytes
SHA-256: ecf1e8e0aa4a99d414fa5e8f0f86cb7f31eb80305a639921521306693334baea
font_01_sfnt_off00017200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17200 13752 bytes
SHA-256: 1d445a5a09bf0890fbc1574e9fa2437c7532657250966cdde4cfcd05acc08a3c
font_02_sfnt_off00019e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E0C 17856 bytes
SHA-256: ecfa91d5e0b903363d3c33d3a42ad84ee85cd745f984491bb3185903d026af1e

Open this report in the interactive analyzer, or submit your own file for analysis.