Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2bb6d06c4b8f75…

MALICIOUS

PDF

75.5 KB Created: 2021-03-27 14:33:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2d9e2f48474c6236484efde9c4912ff SHA-1: 52affb2f744ef87302ef24dfc50963a85947135c SHA-256: aa2bb6d06c4b8f759dceda41e10376cab6b8823b3b09bd3a56103f37c02a391c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and potentially distributing malicious content. The heuristic 'PDF_SEO_LINK_FARM' and the presence of a suspicious URL strongly suggest an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=bears+word+whizzle+answers
    • https://cdn-cms.f-static.net/uploads/4475392/normal_605ee4c4150e7.pdf
    • https://cdn-cms.f-static.net/uploads/4417997/normal_5fdae57adf09a.pdf
    • https://static.s123-cdn-static.com/uploads/4476294/normal_5ffb6bea3079b.pdf
    • https://xarobugogowi.weebly.com/uploads/1/3/4/5/134594165/tovusi.pdf
    • https://cdn-cms.f-static.net/uploads/4426422/normal_604f482ce1e8f.pdf
    • https://fadusibolene.weebly.com/uploads/1/3/4/0/134042843/tijimuzuz.pdf
    • https://loleritukala.weebly.com/uploads/1/3/0/9/130969936/3296944.pdf
    • http://gogovexo.22web.org/adobe_acrobat_reader_word_to_converter.pdf
    • http://pinixubezanamot.iblogger.org/wududasejakiboxos.pdf
    • https://cdn-cms.f-static.net/uploads/4452835/normal_6018a067dc369.pdf
    • http://musagar.iblogger.org/wasabi_sushi_menu.pdf
    • https://lemefiware.weebly.com/uploads/1/3/4/0/134017231/f581f6834c.pdf
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/nurekusovagi-lidaxu-ganifamak-tatitute.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jowutoneranemuk/36562270672.pdf
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_23315bb4d39949b3adcddf101e686e6c.pdf?index=true
    • https://s3.amazonaws.com/belapawerezuju/hardly_when_worksheet.pdf
    • https://69f1164a-dcd3-4310-9fb4-3b67f03bdbb0.filesusr.com/ugd/9d7282_77b27ff62dc6492cab8cd233bee7486a.pdf?index=true
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_8d52743f80c44a9886bc580d73328c26.pdf?index=true
    • https://s3.amazonaws.com/penale/happy_birthday_song_name_wise_free.pdf
    • https://s3.amazonaws.com/resisuna/vosuripopamurafinonamuk.pdf
    • https://s3.amazonaws.com/magapeguwabe/soft_contact_lenses_for_keratoconus_case_report.pdf
    • https://s3.amazonaws.com/posaxugidut/aprilaire_humidifier_560_owner_s_manual.pdf
    • http://keruxenuriwi.epizy.com/5865448171.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_off0000e96c.bin
18949119dcb407f12fac640267aba4d49feca821042f1d3cd45bf879052015df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 5104 bytes
font_01_sfnt_off0000fad7.bin
923f83280a98b244f6e0e55b11d998731eeb3fd5ee0ed5093ea3379a03798c05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 10676 bytes

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