Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7095520fabe78f4…

MALICIOUS

PDF

83.2 KB Created: 2021-03-19 16:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12b49f15aaef7e37941c803e7c0a6b02 SHA-1: 70a773aa682a034cb625570b76db69b8c417f979 SHA-256: a7095520fabe78f4e1fa7c264e81ad3d09cc4e52b5ba01dfafc3bdee58353670
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous external links, including one to 'nipisod.ru' which is suspicious. The document body, though partially corrupted, suggests a lure related to an 'Allianz ovhc insurance claim form', indicating a phishing or scam attempt. The presence of multiple external PDF links, some benign and some unknown, suggests a link farm or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/123?utm_term=allianz+ovhc+insurance+claim+form
    • http://vsspb.ru/wobekii6zyk.pdf
    • http://jiteruruw.sportsontheweb.net/frigidaire_fix_ice_maker.pdf
    • https://static.s123-cdn-static.com/uploads/4448976/normal_5fff11ba01ed8.pdf
    • https://static.s123-cdn-static.com/uploads/4502178/normal_6007b5232825f.pdf
    • https://cdn-cms.f-static.net/uploads/4450417/normal_6046aced5a3be.pdf
    • https://cdn-cms.f-static.net/uploads/4391602/normal_602fd70d15c5e.pdf
    • http://juraxoxodas.scienceontheweb.net/logical_reasoning_aptitude_questions_and_answers.pdf
    • http://siwivelijutore.medianewsonline.com/a_suitable_boy_netflix_series_review.pdf
    • http://meblik.su/how_long_has_the_magna_carta_been_in_useseolt.pdf
    • http://sweetygirl.club/bejeweled_blitz_blast_rare_gemsafio1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_97660306c1784670ae877d33c9a07e69.pdf?index=true
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_9d17f523825f4f11b4fd5fd395b2ff0c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d7ec6f66-6849-4934-af3d-e0d068843b8d/videbibif.pdf
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_f2d3489271364733aaa8ae4ae67206eb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eb7d6daa-fdd1-448b-985e-818d9612d413/ketolofuxumatukopolej.pdf
    • https://uploads.strikinglycdn.com/files/66cd73bb-9814-451d-86b1-27cce1bc2bb3/19934967845.pdf
    • https://uploads.strikinglycdn.com/files/0efba20c-620a-4a73-87ba-e06bc19129bb/tascam_424_mkii_owners_manual.pdf
    • https://uploads.strikinglycdn.com/files/7a1b6b02-ffeb-456a-b897-c4b95587081a/24642593206.pdf
    • https://f5f74d4f-f804-4d9b-9bfa-9964b2756261.filesusr.com/ugd/e389b3_f9ec8f07bd50485596d498902548407e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f6743e56-ed5d-4bd7-8413-759d03c62648/udi_u818a_wifi_fpv_rc_quadcopter_drone.pdf
    • https://uploads.strikinglycdn.com/files/3452dec5-e734-414c-ac64-da9e83a283b1/ralph_waldo_emerson_famous_quote.pdf
    • http://vebusatoro.atwebpages.com/keniritux.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010aaf.bin
578aa97de5eb6f42aeff11fa1b5be88f0c81e3c7ac1b19e34f6a7a8e2ae90abb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 5220 bytes
font_01_sfnt_off00011c55.bin
4d5b0b45994a4ec2d8e616945cf3938f7d44f1d265255c2bf98f058b210e18e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 10400 bytes

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