Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7520ccc541df6c…

MALICIOUS

PDF

77.2 KB Created: 2021-05-24 23:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e4727e1d11e6bb9c582f3b6ce5a2822d SHA-1: 35937949f798c68accc1d418dabd45c375ca2f6a SHA-256: 7f7520ccc541df6c9874b89c25dbfe6ce5ea14a7140e8dcb5dc45be4e48db2e4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://seumenha.ru/strik?utm_term=reset+frigidaire+affinity+top+load+washing+machine PDF link annotation
    • https://xogofodaromaf.weebly.com/uploads/1/3/4/3/134387758/3ba67af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498392/normal_6064f333d7aa3.pdfIn PDF document text
    • https://xibomuwupipufa.weebly.com/uploads/1/3/5/3/135389044/9086e6da976370.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374980/normal_5fdbff26e3bd2.pdfIn PDF document text
    • https://julasunanuk.weebly.com/uploads/1/3/4/3/134308365/dasosimaz.pdfIn PDF document text
    • https://kileligujet.weebly.com/uploads/1/3/4/4/134457719/gawafagog.pdfIn PDF document text
    • https://welaxulisura.weebly.com/uploads/1/3/4/0/134042468/juwisuguz_leponi_lobelufixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406482/normal_602b50794f5df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481055/normal_6046d3bbd086a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443588/normal_602f34c1c96c9.pdfIn PDF document text
    • https://jerusofiv.weebly.com/uploads/1/3/0/9/130969981/5358472.pdfIn PDF document text
    • https://fesoviso.weebly.com/uploads/1/3/4/7/134710514/14bb23794e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_6055f5fbe07dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483864/normal_60367bd1348a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef39016-0281-4df3-bc0c-342de616d6f7/insinkerator_steaming_hot_water_tap_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48da05d8-76ae-4741-944d-5ce0175053b8/lamufekonetaxigeri.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/96408616923.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/zawuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67ffa8fd-8aa3-4c43-8344-36b8bac1d9d2/what_does_dapple_grey_mare_patronus_mean.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_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 5768 bytes
SHA-256: 293423dd32ac126756f7d37944718be495e17d29d745b9096e729e2eb30a1613
font_01_sfnt_off00010334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 10660 bytes
SHA-256: 64dd338b0c7ba0e89356875fb8ec36af18242cec822e463d4066d8c64c18c7e6

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