Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e747914c672fec…

MALICIOUS

PDF

66.3 KB Created: 2020-11-13 22:12:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c658e606f18d4e2868d6c8adb187b999 SHA-1: 13afe38c3c457bc23f371e5075dae2544cccd1c2 SHA-256: 81e747914c672fec167ecd916260aa38050373e021ba97e6b2bbe2c6b146d2c4
156 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 5

  • 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.
  • 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://trafffe.ru/123?utm_term=writing+equations+from+function+tables+worksheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374518/normal_5f8a5b47bc6bf.pdfIn PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/tigaroritegojumidoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473030/normal_5fa669ab3b5eb.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/6955021.pdfIn PDF document text
    • https://rudanivaxaf.weebly.com/uploads/1/3/4/4/134497940/ralomopagovu.pdfIn PDF document text
    • https://wokewimafagi.weebly.com/uploads/1/3/4/5/134598023/8893024.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_5f9c3009e1d53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373527/normal_5f8cabf14bd7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383792/normal_5f8fbbc2b133e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavale/the_old_man_and_the_sea_novel_in_urdu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65ca4f88-c6dd-400f-8a78-ec02845260d5/24378150844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7c88c62-efdc-4c9f-bc7c-96465678506e/the_way_to_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d96d49a-b2d8-4e7b-ac32-f6dc52edcc76/59222421269.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/sokagozopin.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_off0000c29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29C 5728 bytes
SHA-256: 2de0be2d38d7e95ce4b24c26bc3304861a5fa716769c5421cf8824217432d4fb
font_01_sfnt_off0000d60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60D 10780 bytes
SHA-256: dfa9daa96286902a9f4e31692b99dc46fb2a2b29885baae681fb03b3fcc16323

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