Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d052d77ce0aaece…

MALICIOUS

PDF

137.0 KB Created: 2020-12-05 06:13:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1568da81e9aef342f984edda03ecaf70 SHA-1: bf8f124cb9d00ef2ff77c5d7ef7ff5efaedf3164 SHA-256: 1d052d77ce0aaecec3d197dda38305cb7cf4efb44171b3282d759a1ae3997700
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, a technique often used for SEO poisoning or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, pointing to a large number of external PDF links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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=convertir+ml+a+gramos+google PDF link annotation
    • https://romovemesokawaj.weebly.com/uploads/1/3/4/4/134479736/zalivonedewi_tazujujojimifig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414173/normal_5fc4ede29d569.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5f9cf86c1a4ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_5f90a2eb5a402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_5fc2530b778b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404741/normal_5fa2aa9bb71b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5f8b6c222980c.pdfIn PDF document text
    • https://dopuxaponaxu.weebly.com/uploads/1/3/2/6/132695391/89aefdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484815/normal_5fad8ba2662d4.pdfIn PDF document text
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/0324cf738960be0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gotijejaj/piano_arpeggios_for_beginners.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D4CC 4876 bytes
SHA-256: 165c9a409b210456462c0d98809d77f36c5c6660497d69ec7aed7cb679443727
font_01_sfnt_off0001e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E545 10432 bytes
SHA-256: 6c14b35ec664c8c4700c854918c8a1f5624d65fae6e38685aa9accaf010e4054
font_02_sfnt_off000208d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208D1 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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