Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5826b809eabfc8…

MALICIOUS

PDF

82.4 KB Created: 2021-04-26 08:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 806d2422bec20bf2bbc63680d78ba875 SHA-1: 5ebcf751eb53c17ee7b4e77c88752511af4a8d83 SHA-256: 3a5826b809eabfc850e1b157ba9681fe60fe06abf80649420e55d7a694e25c9b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=what+can+i+eat+on+keto+to+lose+weight PDF link annotation
    • http://zhk-samolet-krasnodar.info/6801194344s1ip1.pdfIn PDF document text
    • http://intereriia.com/pufodovubozokaffj19.pdfIn PDF document text
    • http://walujaxe.22web.org/vowel_and_consonant_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/xubodijixali/hckZyhf/forte_piano_music_definition.pdfIn PDF document text
    • http://help-service-support.com/rabuzubawerabifabugq3rl7.pdfIn PDF document text
    • http://grandov.pro/2019_music_videos08g7w.pdfIn PDF document text
    • https://cdn.sqhk.co/koxopumo/iiibif0/tiluzixofikupabijakudet.pdfIn PDF document text
    • http://homeolimp.com/9737839258bw95j.pdfIn PDF document text
    • http://cleaner-inn.club/gutewejosuz7gtpb.pdfIn PDF document text
    • http://superheatbelt.xyz/79061412454rqx3k.pdfIn PDF document text
    • http://domen3.club/34100090122jveu9.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/Uz1if92/4_pics_quiz_answers_level_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0291021d-98ae-4151-9db1-3ccf5eca93d5/schwinn_airdyne_pro_parts.pdfIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_7d437259ce2e4744ae0aa950f6a68a65.pdf?index=trueIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_499be96aba46492d95f53f9ec4e3dd6b.pdf?index=trueIn PDF document text
    • http://febarufowit.epizy.com/vazenududuxanajerutelula.pdfIn PDF document text
    • http://luwidegudaje.epizy.com/masepunininigirir.pdfIn PDF document text
    • http://pesogulovuxolub.rf.gd/iatf_16949_standard_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce9c92ea-160b-4da5-8256-21db3738c075/16285069606.pdfIn PDF document text
    • http://wamulax.epizy.com/lasomorojem.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 4924 bytes
SHA-256: 1d08b970e7fd9077649159e215fef8072d2592fb442d62f8358dd58387cb8c5c
font_01_sfnt_off000108d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 11196 bytes
SHA-256: a8cf3fe27af527ea7edf97bea08ddd34fa3310be64a691f9ce1c45105b864ae1
font_02_sfnt_off00012e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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