Malicious PDF — malware analysis report

Static analysis result for SHA-256 828ae9f8a65b6062…

MALICIOUS

PDF

68.0 KB Created: 2020-11-14 12:35:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 5e6b539d8fd9ff27245e8c1124b443ad SHA-1: de073de7515dd5bff867fb6c300ffad7c44e5a18 SHA-256: 828ae9f8a65b606259e1bae134f687dcebb6374b32174d44b0e66daca9ab836c
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://trafffi.ru/strik?utm_term=robo+signers+list+of+names PDF link annotation
    • https://sazojowob.weebly.com/uploads/1/3/4/3/134351878/konaxowiselon_savimoto.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/wefukifu.pdfIn PDF document text
    • https://ranerenonosojib.weebly.com/uploads/1/3/1/4/131483420/b895a.pdfIn PDF document text
    • https://rodekimixew.weebly.com/uploads/1/3/4/3/134314341/zufusasorifobi-jepumogi.pdfIn PDF document text
    • https://wesoxiworikezux.weebly.com/uploads/1/3/1/3/131380467/vixogoxevuvek.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/8bc5362caf63.pdfIn PDF document text
    • https://notutevetalopi.weebly.com/uploads/1/3/4/7/134715305/c07199a.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/8f86ea6c-8e93-4ca1-90e4-3aacfe8554f7/zamufi.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/achievement_guide_fallout_new_vegas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca36f227-6ea2-4a5f-85d8-8d8a0be07b94/the_monk_who_sold_his_ferrari_review_quora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64efd7d0-ba1c-4dba-ba99-b8c0fa0b1377/99251183523.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/calendario_serie_a_19_20_juventus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a244825-2033-4ce2-9593-f2afc46d833e/4078505574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ce9cd16-6508-4e0a-8bfc-f2f6d95c48a4/marawerujebo.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/datexineri.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_off0000cd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD22 5236 bytes
SHA-256: 7e59f5bef91edd1635a69045be504e313318f958e478454aa5172c31af94f6a0
font_01_sfnt_off0000dee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE3 10608 bytes
SHA-256: 3fdbb0997df94b057978965e42c480a64c9b46ab09f3a7c8b08bed1a213f901a

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