Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff60890cbe2a685…

MALICIOUS

PDF

81.3 KB Created: 2021-03-04 22:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: db9f06d0f9607b7e00e6e40423b51b31 SHA-1: 3610603e29234d45b0eef84c4273c4e66382886d SHA-256: 4ff60890cbe2a68545fb1f62d97d72e6eab428cb2b06f43b9c3d5eb3090af20d
194 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous external URIs pointing to other PDF documents hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jumiwimov.ru/strik?utm_term=how+to+set+up+intervals+on+map+my+run PDF link annotation
    • https://xemubafuwifo.weebly.com/uploads/1/3/4/4/134475424/c46565d1cf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494433/normal_5ff6d35a8bf83.pdfIn PDF document text
    • http://juvozukatug.66ghz.com/21732913818.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/ed0979.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370768/normal_6008139dc72a9.pdfIn PDF document text
    • http://pipopituga.22web.org/wrong_turn_all_movie_tamil_hd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_6028ea20494af.pdfIn PDF document text
    • http://natasisenexu.22web.org/53347113737.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejanofe.rf.gd/vuxuliwogul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5527dac-e0a0-46fa-b06b-837432df5d34/best_microwave_repair_services_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f330228-8ab6-4b10-97b5-26d33460d723/wipe_warmer_prince_lionheart_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab92f2bf-57d3-4f91-8141-3c6cc17c98fb/jijawifolaxonademafiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/157db41e-3751-4624-9b05-81b95f2ba3df/5th_wave_feminism_mohammed_hijab.pdfIn PDF document text
    • http://bobitemobo.epizy.com/39597876188.pdfIn PDF document text
    • http://faxowenifediwok.epizy.com/how_to_refill_ink_cartridges.pdfIn PDF document text
    • http://lofadezowudekeg.epizy.com/animal_genetic_deformities.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/55782329951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2750cf17-bcaa-4192-9db9-a3f01e99cbe9/79846175819.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/who_is_the_little_mermaids_dad.pdfIn PDF document text
    • http://farekoze.epizy.com/como_fazer_para_sacar_dinheiro_do_cartao_de_credito_bb.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 5180 bytes
SHA-256: 307f6bf58038afae24b435a2693187c47e619bcd57662c64ad2a6e6b086ae902
font_01_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 10728 bytes
SHA-256: a52fadc790d8c6c583ad82610bd59faee9b4d9f366ed4b27fb66e7c8d080f854

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