Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1762005aafa9c1e…

MALICIOUS

PDF

77.0 KB Created: 2021-03-19 04:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c17c56b804a42d2e87f8389b4261bf19 SHA-1: aa6b99971603828c99e7b72373018ff914dbdab2 SHA-256: f1762005aafa9c1ec2fbc2981451e18fbbdd7374f0975fd124835db2a4505165
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The primary URL points to a page related to cleaning a humidifier, which is likely a lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=how+to+clean+a+homedics+cool+mist+humidifier PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421333/normal_600db2867c7e1.pdfIn PDF document text
    • http://luminar4-download.xyz/54039317115hkqdz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_602acbd513913.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzonabudad/8ciihb1/lavuxakikutuvep.pdfIn PDF document text
    • https://cdn.sqhk.co/gunakawujo/giigiQt/pixel_grand_battle_3d_mod_apk_home.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492272/normal_5fd2dbfbf260a.pdfIn PDF document text
    • https://cdn.sqhk.co/regomesu/I4gfOjh/alan_walker_tiles_hop_music_games_songs_download.pdfIn PDF document text
    • http://how2clever.com/423642780022hyz1.pdfIn PDF document text
    • https://cdn.sqhk.co/zirevazul/ja8jfij/checklist_example.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/i1sdheY/cup_stacking_game_team_building.pdfIn PDF document text
    • http://vknacruckalaikov123.xyz/torsion_dynamometerum88r.pdfIn PDF document text
    • https://cdn.sqhk.co/navififoro/DVOZajj/undeniable_meaning_in_punjabi.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/4hg1h6v/govobalufojebusoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_3dd3864c08464e74858e7dd5605843cb.pdf?index=trueIn PDF document text
    • http://sidepojedava.myartsonline.com/big_bang_theory_universe.pdfIn PDF document text
    • http://benamow.myartsonline.com/un_barrage_contre_le_pacifique_analyse.pdfIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_c5604e85d0504bf0b43157ddc1138a31.pdf?index=trueIn PDF document text
    • http://zejibanunepi.myartsonline.com/fazejuk.pdfIn PDF document text
    • https://288dffde-0386-48bd-adba-b069b5f3b70f.filesusr.com/ugd/7e1b39_6ef1e98caae04f69a2fd1e12a3db30c6.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF6 5316 bytes
SHA-256: 23d28ea2dc0521cdbccbb3f4a4fc39e4dad58af366ec3d4b484a45ad71b76986
font_01_sfnt_off000101ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 10664 bytes
SHA-256: d40b947a819f71605c677e4e3a4124ed056e7a3bf4e175e6ae7b9a94015031cc

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