Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6914dc37866e2f…

MALICIOUS

PDF

80.1 KB Created: 2021-03-22 10:19:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 05f8d1c2ebe59d5aa4d688daac67f28f SHA-1: 14ec6a16bac75b201fd6627261343df670404380 SHA-256: df6914dc37866e2fbb6c623bc22bbcf4af001536c46b0ca7d33b45e78ddeac22
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links pointing to various PDF files hosted on disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is part of a phishing or malware distribution scheme. The document body is heavily obfuscated and does not provide clear instructions, but the overall structure points to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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://dafemum.ru/wix?keyword=ejercicios+de+factorizacion+resueltos+pdf PDF link annotation
    • http://keto-s1.com/zilosorurebezasusofoxrszm3.pdfIn PDF document text
    • http://tizezs.xyz/telugu_kathalu_onlinegkvrz.pdfIn PDF document text
    • https://cdn.sqhk.co/pefapalotux/prjdjd2/savobapudewes.pdfIn PDF document text
    • http://kinoogf.space/xupevagexiwiputhq1s8.pdfIn PDF document text
    • https://cdn.sqhk.co/nokodexuxof/Aiehcie/82520539351.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/cifaiv6/20514016267.pdfIn PDF document text
    • https://cdn.sqhk.co/bozadukopufu/gdwwS3D/noaa_weather_forecast_seattle_washington.pdfIn PDF document text
    • https://cdn.sqhk.co/duzixulok/xjhfmhd/networking_commands_in_linux.pdfIn PDF document text
    • https://cdn.sqhk.co/korulifesewa/mkhdihW/60809505861.pdfIn PDF document text
    • http://reznitskygallery.com/93898993657w9tkq.pdfIn PDF document text
    • http://prechambre.xyz/reliability_centered_maintenance_bookqtec7.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://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_e7c5ce9fe0434a24808d00cbe553e89a.pdf?index=trueIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_b88e94a581af447ab94e69c11f845b7e.pdf?index=trueIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_33225864c9c046989bc9cee4cde40819.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_a5f9d109db0641119b8c421533937f67.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_e3d369eeeb8d452591b93ba34625472c.pdf?index=trueIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_e8bb8606a8974a698d66e921b3ffde95.pdf?index=trueIn PDF document text
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_3cb993f05db9454497e256fa14579b8f.pdf?index=trueIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_5a9267b8e2d240079362f17c15d8ff12.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_a2dd8c697f384b50bd477ae8ed4f44e2.pdf?index=trueIn PDF document text
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_9054ba3971744956a0fa31ecd7a23848.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_1de44d1d8ec8481d850003749184be5f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99C 5112 bytes
SHA-256: b6c5d37e5f8b123bb4e0b71482e4e0c0a6b95e8050004a8d2107d2c1db5e3d87
font_01_sfnt_off0000fb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 12144 bytes
SHA-256: 04113d149e8a202f544c2dcd6d6c56aa425be8f1968d45fe89113774c4da8372
font_02_sfnt_off000122d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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