Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed405299040beb7…

MALICIOUS

PDF

73.8 KB Created: 2020-12-18 00:34:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 951865bd6cd603eaaf957f3e7631e65d SHA-1: 3ce59fbb86d44b65951b8c9a32696fed5bc2a048 SHA-256: 3ed405299040beb7ec909a2a271016351e7dca65f6867f02823bb3d220e170d8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious sites.

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://trafffe.ru/123?utm_term=un+viejo+que+leia+novelas+de+amor+resumen PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487647/normal_5fc4d169e7995.pdfIn PDF document text
    • https://pekedilude.weebly.com/uploads/1/3/4/3/134324883/c6a88d61348fb1.pdfIn PDF document text
    • https://vonekinorosasox.weebly.com/uploads/1/3/4/7/134732286/kukitumaxop-kiwuto.pdfIn PDF document text
    • https://wolalusajiri.weebly.com/uploads/1/3/4/6/134600438/guvevawiresapadosu.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/5122846.pdfIn PDF document text
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/5e623.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fcf111089e267495dea1fd5/t/5fd671c6ab1a676c7290a17d/1607889351501/new_bullards_bar_fishing_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/049633bc-0ec4-48c1-bc54-b48db4018ef5/music_ministry_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f00b887-979b-44ea-9e1f-37891303ac66/choque_de_cultura_meme.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6c9ba43c5ee75bf27f545/t/5fcc3522920f47545b85da32/1607218466947/piggly_wiggly_sumter_sc_15_south.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2f42b9-b68e-4b15-a95a-698a8612a201/xivamob.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_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 5224 bytes
SHA-256: 8f5bacc3e8a975c9cf8a6675fcf60d0a78eb9d619d1f93f2a2f2b23ba5becbd9
font_01_sfnt_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 11016 bytes
SHA-256: b6a2d68c43a74d1335da2440b2f80339faedfb9b2233e41c776d18b8b1441b7f

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