Malicious PDF — malware analysis report

Static analysis result for SHA-256 40533ebc312d542e…

MALICIOUS

PDF

78.1 KB Created: 2021-04-01 23:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 98adc5c74529ff20fb0b944e00bce493 SHA-1: 8da160908bcaf0d51e2919d011658c557ae5ce6c SHA-256: 40533ebc312d542e85e3f9bf065c8cec5919c4811ec543e5d31c446cba8577a1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to product comparisons, likely a pretext to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://botokaw.ru/aws?utm_term=hoover+floormate+deluxe+hard+floor+cleaner+vs+bissell+crosswave PDF link annotation
    • https://cdn.sqhk.co/vakolitakap/gi5CPgh/57908674531.pdfIn PDF document text
    • http://hookup757.fun/how_to_become_a_special_ed_assistantgnby1.pdfIn PDF document text
    • http://bunnygummy.ru/structure_of_hno3g86el.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/A3ggtZZ/download_ejen_ali_emergency_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/KVifxhe/vrtv_vr_video_player_pro_apk.pdfIn PDF document text
    • http://opensalon.xyz/22008693511qhzlm.pdfIn PDF document text
    • http://rte-ita.fun/kuwapojupis5z9o.pdfIn PDF document text
    • http://tramlaweq.online/graco_tranzitions_3_in_1_safety_ratingecawc.pdfIn PDF document text
    • http://tvoyoproc.fun/212287190074g24g.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/45559162966rprmf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444098/normal_6035cc3c9a4e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_60144af20368f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_43f4e61b55cb48a7a4fb55776591c650.pdf?index=trueIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_30d272e7b2294ed585fdc88bb5a5815c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/single_member_llc_operating_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/actions_the_actors_thesaurus.pdfIn PDF document text
    • https://ddb281da-11d2-423e-b83a-408ecf1f607f.filesusr.com/ugd/9db61c_941364e1f3b743649acb87ea3ba735f7.pdf?index=trueIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_6d19fcb5f65742cb9cd7ab4a3cc5cdba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/abbyy_finereader_14_standard.pdfIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_14eac2a2a90e4a2496d2c7a768ab0ed7.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_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 5580 bytes
SHA-256: 4787d69bfcb16d4be0eac4316b5fad9686af0ad769bb355e6889ffb7ec97d394
font_01_sfnt_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 10616 bytes
SHA-256: 92f164a98c08ebbd174401cee298d721c9ae64e9821d1a741fe36c2cf3ea14ec

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