Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15098b660ebbeb9…

MALICIOUS

PDF

72.2 KB Created: 2021-01-01 14:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6f77f9ecba9216264084fbb13fe1160e SHA-1: 23b97b0a65cdb26e658f23e3d19f9881d41701aa SHA-256: d15098b660ebbeb982d68b95d0102b92410543ab2347a79cf0c1a784cf927a65
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The document body, though heavily obfuscated, contains text that appears to be a search query for an APK, suggesting a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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=shoot%20and%20run%20western%20apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486220/normal_5fac199d7de6f.pdfIn PDF document text
    • https://kevapesezivobi.weebly.com/uploads/1/3/4/8/134893959/1792809.pdfIn PDF document text
    • https://cdn.sqhk.co/risevejuxik/fjfD7jf/77687970637.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/aaljdhj/zimogi.pdfIn PDF document text
    • https://fobaripiso.weebly.com/uploads/1/3/4/4/134443650/susazifil.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/povodijirig/the_perfect_law_of_liberty.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/49495283582.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/turning_point_usa_arizona.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/31175718450.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/medicare_and_medicaid_nursing_home_guide.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_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 5276 bytes
SHA-256: 199d26ce2243baaab6afdfd4b67484f1f61bde58e1d40d27fff5b7cf9aaaed07
font_01_sfnt_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 11984 bytes
SHA-256: a687443c11085fb32e9e585efaf628c957a6509d772cec3c432b4b13cc61b637

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