Malicious PDF — malware analysis report

Static analysis result for SHA-256 246f19d4cc72145b…

MALICIOUS

PDF

86.3 KB Created: 2021-05-25 08:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 65fc4d48e14b78df145b51f28c320e57 SHA-1: 51ab8ea5f8d376beeecff9845310c745c1aa9455 SHA-256: 246f19d4cc72145b657cae7ba8e61e23390719809c1b328126d1cd0a2269cfcd
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 0.9997

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://bologen.ru/strik?utm_term=are+avm+dangerous PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4394060/normal_6036d6be91b84.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530171/normal_5ffc5419db59b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500430/normal_5ffe30c501a67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417315/normal_60069ae482a1c.pdfIn PDF document text
    • https://wipovatoz.weebly.com/uploads/1/3/4/0/134012317/zesojekawo_lozizakar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417327/normal_5fc9fb382756d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413980/normal_5ff8c139cdc3e.pdfIn PDF document text
    • https://karelevoziwoda.weebly.com/uploads/1/3/4/7/134718414/7064958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420019/normal_6057b2ad1dcc6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_600a634485050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451762/normal_6021572b96244.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/mexavofezoxi/bullet_for_my_valentine_discography.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/cura_3d_printing_slicing_software.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/answer_to_how_are_you_keeping.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/can_i_share_from_facebook_to_twitter.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/48720531182.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/wisefozekawud.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/57631325532.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/80637995902.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/graphing_lines_using_standard_form_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/12860845768.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_off000114e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E4 5160 bytes
SHA-256: 90190703eea8ac5d8e3224cdc898973193ee89b054a08835f3bb0af6f2927244
font_01_sfnt_off00012667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 11352 bytes
SHA-256: fad98a697f1b24a5cabe361c71d8da436701b9c567669ab9c6dcd45856d3c895

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