Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a1800c5c0cbbf1…

MALICIOUS

PDF

71.1 KB Created: 2020-12-26 19:15:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 54431d1be44927f9ecf39aad10bc17d8 SHA-1: f7173ebc2a11406123f06ea9daac5bf980906229 SHA-256: 03a1800c5c0cbbf19114baaf4248b81e38234bd9242dff624443214c89fcf7b7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many hosted on disposable domains, suggesting an attempt to redirect users to potentially malicious content. The PDF_SEO_LINK_FARM heuristic indicates a significant number of external links, likely for SEO spam or phishing. No scripts were extracted, but the presence of external links points towards a phishing or malicious redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=hit+or+miss+lyrics+boyo PDF link annotation
    • https://cdn.sqhk.co/voromerubagu/JgiGJge/anime_wikipedia_pl.pdfIn PDF document text
    • https://judurufag.weebly.com/uploads/1/3/4/6/134688768/xegomifumojuzewep.pdfIn PDF document text
    • https://lapebezufidasaz.weebly.com/uploads/1/3/4/3/134316617/8869167.pdfIn PDF document text
    • https://dawiganolakegoz.weebly.com/uploads/1/3/4/3/134367714/7233248.pdfIn PDF document text
    • https://woruranevulabiw.weebly.com/uploads/1/3/4/0/134096732/1542102.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/357a0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_5fd619c23fd73.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/pivowa-lirizus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_5fe6cf969427f.pdfIn PDF document text
    • https://wevupifusa.weebly.com/uploads/1/3/4/3/134356286/fudezudubedulo.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/gOL6Khe/emergency_alerts_android_9.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/topipovikapari/18536439285.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/food_cost_percentage_formula_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16cb4850-7886-48d2-86ef-d6185ae8fae3/technewsworld._com_security_malware.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_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 4936 bytes
SHA-256: 757495276b69ca281453ebe28edc062f90e46ce6073b0b1444329c07b7e5f8f7
font_01_sfnt_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 10196 bytes
SHA-256: 6fa86a202838625371622d20a483cbc205f32561a10310df39e03626ae6613ff

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