Malicious PDF — malware analysis report

Static analysis result for SHA-256 08662daabc0d4101…

MALICIOUS

PDF

69.4 KB Created: 2021-03-16 16:51:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 021d1e86cefd9b43bee7dfc66e332267 SHA-1: e51e6c369562a8fa51157d4172b928e965da0729 SHA-256: 08662daabc0d4101a8ed4e6d0ad8949111dea9deede629724e06a33b0ccf20b9
184 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, with one specifically flagged as a known malicious redirector: https://crophysi.ru/award?keyword=fenomeno+tumoral+dr+isaac+goiz+pdf. The document body, though heavily obfuscated, appears to contain metadata related to 'wkhtmltopdf' and a medical term, suggesting a lure to disguise the malicious intent. The presence of many disposable domains and link farm characteristics further indicates a phishing or malware distribution campaign.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=fenomeno+tumoral+dr+isaac+goiz+pdf In PDF document text
    • https://zalidumi.weebly.com/uploads/1/3/5/3/135351231/2760245.pdfIn PDF document text
    • http://veviwumifuvemuz.mypressonline.com/mimogarogevarevidunenasir.pdfIn PDF document text
    • http://mesretly.xyz/2008_dodge_grand_caravan_4.0_transmission_fluid_capacity58fef.pdfIn PDF document text
    • http://xulazawelinuze.scienceontheweb.net/kajelatibukutovameli.pdfIn PDF document text
    • https://malojedatev.weebly.com/uploads/1/3/0/8/130813840/9ae300b2ba6.pdfIn PDF document text
    • http://esclick.pro/economie_bts_mucw8us0.pdfIn PDF document text
    • http://specrazreshenie.com/logic_puzzles_printablelogic_puzzles_printable5ieww.pdfIn PDF document text
    • https://sakeneri.weebly.com/uploads/1/3/4/3/134339958/69b488.pdfIn PDF document text
    • https://taxajefikudo.weebly.com/uploads/1/3/4/7/134765143/lokore.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://4f870d4f-701c-4ec6-bbb3-7277acc5528a.filesusr.com/ugd/fdcb8d_cbcc924ab20945b3b5d885a60a042169.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/jojizivakazave.pdfIn PDF document text
    • http://bexovivuvere.myartsonline.com/kobowa.pdfIn PDF document text
    • https://0537d68c-d73d-48e4-855c-cd76be829c64.filesusr.com/ugd/cacfd7_25461e841d0e44179a492e59d29293f5.pdf?index=trueIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_a72479c60ed4414ba6a9f4e27b2abd59.pdf?index=trueIn PDF document text
    • http://xepuzakudera.atwebpages.com/tom_clancy_book_rainbow_six.pdfIn PDF document text
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_d8954695905f422d825149fcc7128d8a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tamovagag/format_for_requesting_account_statement.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_off0000c4c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C3 5364 bytes
SHA-256: 3dd6e87ed2b3d1277b83d0eba3165fb5323360b452029a8e76101a027f0ace4e
font_01_sfnt_off0000d6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F1 10632 bytes
SHA-256: 62be5bf8b89235133115963bbd249220374f55cdb8cd270218385b74503011ee
font_02_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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