Malicious PDF — malware analysis report

Static analysis result for SHA-256 340c2291e6015185…

MALICIOUS

PDF

79.2 KB Created: 2021-01-22 06:13:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a2e1979f8989dc01163c07bbb67453ec SHA-1: 9c71963c7e1aaf749da04aa528ab4274e606cf03 SHA-256: 340c2291e6015185fb85a1118051fa0c0d5d67537e882417806e158be85e8d5a
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded content, though heavily obfuscated, appears to be a lure related to 'black horror wallpaper 4k', directing users to external URLs for further malicious activity.

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://traffset.ru/wb?keyword=black%20horror%20wallpaper%204k PDF link annotation
    • https://tedipoji.weebly.com/uploads/1/3/1/4/131408178/wufukibipedadi.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/15301def5081c3.pdfIn PDF document text
    • https://xufalawat.weebly.com/uploads/1/3/0/8/130814535/kukirolemifufo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416140/normal_5ff7ecfc485c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481663/normal_5fe502cfdb99a.pdfIn PDF document text
    • https://site-1197027.mozfiles.com/files/1197027/1788933041.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469365/normal_5ff361d50a209.pdfIn PDF document text
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/f934ad7ca58a.pdfIn PDF document text
    • https://tatedugede.weebly.com/uploads/1/3/4/3/134311852/3182071.pdfIn PDF document text
    • https://kolokizegilo.weebly.com/uploads/1/3/4/3/134370221/wamad.pdfIn PDF document text
    • https://dodukitomot.weebly.com/uploads/1/3/1/4/131407143/1d20528.pdfIn PDF document text
    • https://takigufumugo.weebly.com/uploads/1/3/5/3/135345847/xokupixuseleleteg.pdfIn PDF document text
    • https://site-1197012.mozfiles.com/files/1197012/documentary_script_template_word.pdfIn PDF document text
    • https://site-1171591.mozfiles.com/files/1171591/duck_life_space_unblocked_math_playground.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/ganubifirigevi/jojigemilizitopigul.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_off0000fc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5D 5136 bytes
SHA-256: d7fb352e785f81a3e4f4038f6f102c6f889d588286c549176172eb59a607d769
font_01_sfnt_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 10004 bytes
SHA-256: edddd46d8d6b72f6a52fe97b86a456dfbc9468f50d774d1f21398724c7995d42

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