Malicious PDF — malware analysis report

Static analysis result for SHA-256 745956663e8d0df5…

MALICIOUS

PDF

84.0 KB Created: 2021-03-08 18:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e58034cf94da8c946078f33f7aecbeb8 SHA-1: 0cea3d87594bdf547e15a1aa8d7766af2ec449db SHA-256: 745956663e8d0df5c49aececdd210f8501c934760658b1452cb677d1a9204b4b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=a+kilocalorie+is+a+unit+of+heat+energy PDF link annotation
    • http://tpdreport.com/kemavojutinuvawimopuwkbdpj.pdfIn PDF document text
    • http://karaulovlife.site/58741163524qqyje.pdfIn PDF document text
    • http://globalsafegroup.com/62257607412bgd0l.pdfIn PDF document text
    • http://bigpleasure.ru/how_do_i_fix_my_roku_remote_not_workingu9nqm.pdfIn PDF document text
    • http://vir-tus.com/295161729518bc7q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_dd75238f40b340168419361746dc548c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe49f245-ca35-4d72-8616-45783db30b52/1st_20_cube_numbers.pdfIn PDF document text
    • http://wilixafex.epizy.com/advanced_life_support_erc_guidelines_2015.pdfIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_654fbcf0fcb249be969028a637f52ada.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b5286ad-f62d-4f50-a636-10fab790b869/board_games_online_with_friends_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa8cc628-3a80-42e2-8659-7186140d1bce/2014_jeep_cherokee_problems_forum.pdfIn PDF document text
    • http://nagajawonusagu.epizy.com/lagu_ost_antara_ada_dan_tiada.pdfIn PDF document text
    • http://piwuzodoxomox.epizy.com/thank_you_maam.pdfIn PDF document text
    • http://xozodijavoxovun.epizy.com/sideload_android_apps_on_windows_10_mobile.pdfIn PDF document text
    • http://walevuzu.epizy.com/gorilla_my_love_characters.pdfIn PDF document text
    • http://zapuvem.epizy.com/62338924451.pdfIn PDF document text
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_f08c05db85e14b759cd567d391ead31a.pdf?index=trueIn PDF document text
    • http://dudibagigop.rf.gd/little_big_planet_3_trophy_guide_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d30607-ad09-49d1-87f2-8655a597cdc5/herbalife_shaker_cup_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b58e3ab1-cc8d-43fc-a52c-47d7c43cc236/pusoxodax.pdfIn PDF document text
    • http://suvofaga.rf.gd/dijitizosopiv.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_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 5300 bytes
SHA-256: 44170252d990e12c2e78af20ed3d2112f5ee23eef27a61a2b2f4701c7d723dd9
font_01_sfnt_off00010625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 11548 bytes
SHA-256: 4a4859480df229e99b10d2289e83c69486450a487acf66fdf7f17f7558483e01
font_02_sfnt_off00012d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D77 16060 bytes
SHA-256: c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c