Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae1930329481c59…

MALICIOUS

PDF

76.3 KB Created: 2020-12-01 22:06:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d6f677ffccf1884fdd1b5f9d682cc844 SHA-1: 8a2ea7822b4ac2975a557d61f4b564d3fa1b2f05 SHA-256: 3ae1930329481c59e5b9d4a68f2af1dd22f70bcada7fbd07fd855ea8e202020c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. ClamAV and ML classifiers strongly indicate maliciousness, specifically a phishing or trojan payload. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://trafficel.ru/strik?utm_term=huaxia+chinese+school+san+diego PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464068/normal_5fbfb4993ceaa.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/fcd46d2ee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372376/normal_5fb6e6524d94a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369329/normal_5f8e26395c477.pdfIn PDF document text
    • https://nogegonimever.weebly.com/uploads/1/3/4/3/134340032/tolumezeduxelagiki.pdfIn PDF document text
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/fakuremeposojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5f92343f66240.pdfIn PDF document text
    • https://rubajamepufukav.weebly.com/uploads/1/3/4/4/134432722/kixinemivana_malodinoranikep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384461/normal_5f926467d6498.pdfIn PDF document text
    • https://famatogovux.weebly.com/uploads/1/3/4/6/134614416/wexumika.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/kigavanus/6775272387.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/56878527884.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/inferences_worksheet_year_4.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/1341477637.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/google_sheets_find_duplicates_across_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d96a0d17-528f-45f4-930e-c867b56b5a47/28233322907.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_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 5136 bytes
SHA-256: e1f22bff0b46f757ab909a15b0583799816234047ce0fc5e5764569f3deab273
font_01_sfnt_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 11368 bytes
SHA-256: f8b8b915773b875f57fadf272472aa1cc31ca4c69779e8922c4c0c8ae0be133d

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