Malicious PDF — malware analysis report

Static analysis result for SHA-256 708fd6f9fddb1056…

MALICIOUS

PDF

74.1 KB Created: 2021-03-23 00:42:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f9c4f09ffe739929ca6e2161bb7ca06c SHA-1: c842e63072f6e5a1164f35301b7e9ee48a9e9a4b SHA-256: 708fd6f9fddb1056e4df6dce234524aedeed99e104e57fd7fa1fe0f2b558b814
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URL 'https://pelibifir.ru/strik?utm_term=what+is+the+cards+against+humanity+absurd+box' is the primary indicator of this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=what+is+the+cards+against+humanity+absurd+box PDF link annotation
    • http://wijofotezopadik.medianewsonline.com/jixawezipeg.pdfIn PDF document text
    • http://edevletorg.com/rujowotitekam9m7.pdfIn PDF document text
    • http://x-bionic.shop/wujenefokqgb3c.pdfIn PDF document text
    • http://zoo-taxi.site/rejisivuzufifusude1s19r.pdfIn PDF document text
    • http://ptmonline.ru/nefazipujezosumijidavea27c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_3980bfd19a6f467585d93d53b0fac54c.pdf?index=trueIn PDF document text
    • https://4c38db24-2924-4bf2-81c9-04860d987a69.filesusr.com/ugd/a68d8f_16fac088156047a7b7f576d8c0d4670b.pdf?index=trueIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_9a978edd32fc4620a07c4dddb7a33e3b.pdf?index=trueIn PDF document text
    • https://df9240ce-57b4-430e-a582-521170ca5232.filesusr.com/ugd/10b03a_b48778d9741d4d45828eca2589b73d35.pdf?index=trueIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_5cb0dc0aea3d43f8903cd88d13ad0c43.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/62e2b2f9-aaaa-4eac-a404-59ab351160c7/how_to_change_transmission_fluid_in_2005_cadillac_cts.pdfIn PDF document text
    • http://lipabarud.atwebpages.com/moxizibuvoginatopuza.pdfIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_a2fbe2ca9fb747328c6a9cd6903a0288.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ce86041-78e8-47dd-a3b4-7090d4e1bb22/kusewularikeguvamafak.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_f91eda0a85134164995c108ec83e6cf7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6794bbd-3dbd-4e41-8b3d-2fe83a79eb2e/dovomakowanivuda.pdfIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_2d1addfe7f354992b7db263db201a38e.pdf?index=trueIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_366a67583e544fd1bc1db402166a4098.pdf?index=trueIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_d2a64b6f2b404754aab447eb894e4fc3.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_off0000e1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C3 5644 bytes
SHA-256: 77dd085320941a01f77a3465b2b3a48ade26dc3a5abeee4b0086fbbdda96a515
font_01_sfnt_off0000f4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 10544 bytes
SHA-256: 49b65e0e8d43257a740b18031b78a867d402048a38464193416c960226efdcea