Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7c356b2ebdc768…

MALICIOUS

PDF

109.3 KB Created: 2021-03-13 20:55:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64aeac745233ce80a6db10ac0334795b SHA-1: d2206448de1a2ef9a1e2ba6dc482fb81cda95b94 SHA-256: de7c356b2ebdc76894d824b29289a9b7a4e43f5c7007c23e56366571bceee94d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model also indicated maliciousness. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or a method to distribute further malicious content. The embedded URLs are likely used to redirect users to phishing sites or download additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=runescape+alchemy+guide
    • https://cdn-cms.f-static.net/uploads/4403413/normal_5fdb8feaef680.pdf
    • https://bajomunimiru.weebly.com/uploads/1/3/1/0/131070213/pejor-jaxoluwijetim-sugapuretaj.pdf
    • http://static-start.top/past_passive_exercises7ah3s.pdf
    • https://cdn-cms.f-static.net/uploads/4369308/normal_6011d1ee0ebba.pdf
    • https://fidojosamesevuf.weebly.com/uploads/1/3/4/5/134594598/2588558.pdf
    • https://cdn.sqhk.co/rewakevutel/JgdZkif/vintage_japanese_pachinko_machine.pdf
    • http://lnstagramverifiedbadge-media.com/874446723091kb4c.pdf
    • http://inertbhjbj.ru/1891837565q6uer.pdf
    • https://static.s123-cdn-static.com/uploads/4488314/normal_5ff25640bda37.pdf
    • http://ketotreno.buzz/93616798891by96q.pdf
    • https://cdn-cms.f-static.net/uploads/4410414/normal_6028b6f472623.pdf
    • https://menufepu.weebly.com/uploads/1/3/1/1/131163725/8471121.pdf
    • https://cdn-cms.f-static.net/uploads/4459029/normal_602156b25ecb9.pdf
    • https://cdn-cms.f-static.net/uploads/4459788/normal_602b3320efd24.pdf
    • https://lozatovetifeg.weebly.com/uploads/1/3/3/9/133999134/sopujadipek.pdf
    • https://wotawodakel.weebly.com/uploads/1/3/5/3/135316359/salunelosodozujuvo.pdf
    • https://magagitu.weebly.com/uploads/1/3/5/9/135959352/9289472.pdf
    • https://cdn-cms.f-static.net/uploads/4380858/normal_60463e90cadac.pdf
    • https://cdn.sqhk.co/lozosasuxe/phfMjgg/69994714791.pdf
    • https://kezozebajex.weebly.com/uploads/1/3/4/2/134265808/f14c97f9056a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000170e1.bin
3b152bc282cff5ddca0545440731763067bbdfc7f3d615da4aef3b054e4d5f93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x170E1 5500 bytes
font_01_sfnt_off00018383.bin
2dcb51b3ead9c2d8e066310cc351847c71ca7895b5b7622fa7f6be5da7443902		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18383 10668 bytes

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