Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6822a96ef4facb…

MALICIOUS

PDF

82.5 KB Created: 2021-03-20 15:20:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5ec12a85814ab5d3ab951ac26145bfdb SHA-1: 9f0fb00f36666258cde315b0cd1f7a32041e54d7 SHA-256: cf6822a96ef4facb5d1337b043cdc5151dcb822fbfcf877acaa86d45c43dd48b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://nipisod.ru/strik?utm_term=ipad+mini+2+and+4+size+comparison PDF link annotation
    • https://cdn.sqhk.co/zanivuwiduvo/hirWJgj/82792967013.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/richard_ii_shakespeare_monologues.pdfIn PDF document text
    • http://dajexori.mypressonline.com/simple_portrait_drawing_tutorial.pdfIn PDF document text
    • http://tebeririz.scienceontheweb.net/83019713713.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/cl8ijif/brick_breaker_quest_level_284.pdfIn PDF document text
    • http://sunuzajiwexo.22web.org/pitazi.pdfIn PDF document text
    • http://vosojivaru.mypressonline.com/astral_projection_guide_book.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/bonovovavap.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/iaQNEge/xepudedujobodo.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/37408916949.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2ac8321c-28d8-41c8-ac7a-99137a6fe030.filesusr.com/ugd/157ee0_b3d59a24eadf42b38322f43390a33f2c.pdf?index=trueIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_66aef851b8f84980894188cdad6a2d0a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/nubifepusofarabixe.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/3469357481.pdfIn PDF document text
    • http://paporoj.rf.gd/6810691445.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/basalte_deseo_manual.pdfIn PDF document text
    • http://rewigikokisiw.epizy.com/verb_list_for_kids.pdfIn PDF document text
    • https://9f61dd91-ea7e-4edc-a837-c43fae5dccfb.filesusr.com/ugd/ed897c_938ba2b090f94e94b7904abc661f0e85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xidazeze/dell_optiplex_7010_sff_drivers.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_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 5396 bytes
SHA-256: b3e53a7b0fac6bfb4ab1d21456d09df2e1e44b5eac973271f74ea1873c14912b
font_01_sfnt_off0001146f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146F 11408 bytes
SHA-256: 30a0972a0b52bdc05c7bc0cb382eaaa15663455cfbaaaf566ccfc1d97569ba51

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