Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a04d71c2a44c08…

MALICIOUS

PDF

74.7 KB Created: 2021-04-23 00:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d6ca2799213370c078fec369e1137657 SHA-1: 24956e6624cabb03eab97ac3bbb3d0ef9f57e6d1 SHA-256: 45a04d71c2a44c086434430a429a7ef4182fc13cb9a7e06a02a1c6a4cbd58fda
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and a heuristic firing for a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of external URIs and the overall structure point towards a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/strik?utm_term=data+structures+algorithms+and+applications+in+c%252B%252B+sartaj+sahni+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379613/normal_5ffba65b2c407.pdfIn PDF document text
    • http://womizepivilora.sportsontheweb.net/puganolumavikikilipi.pdfIn PDF document text
    • http://zebozewazogaso.scienceontheweb.net/xafewilemojerejevuxujeni.pdfIn PDF document text
    • http://antonioit.fun/how_much_time_between_sets_of_pull_upsg9oip.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/7PPJjdN/folezerewaluwudibosoginiv.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/dhZPRbS/51088498374.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408481/normal_5fddfa98c9e92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405654/normal_6031e0a99113d.pdfIn PDF document text
    • http://sobakin.space/xulagitokimezutiv2e35n.pdfIn PDF document text
    • http://itdiscounts.pro/assimilation_policy2xpeg.pdfIn PDF document text
    • http://zusagukitu.mywebcommunity.org/scratch_3._0_tutorials.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/FgfRicU/78644778358.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0f4267a5-27df-427f-b7ff-de3c6d4a4cd0.filesusr.com/ugd/9e4921_599d6fbc9b8e4d1f9f507dc9e61755a2.pdf?index=trueIn PDF document text
    • https://4f6c49ad-35c2-4e1b-a50e-a4ca4816ee30.filesusr.com/ugd/a28dad_0eff3e9bfc0d46e5b7e43493d085b4f7.pdf?index=trueIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_c47d8e7ddca94a498be7817cd4193a39.pdf?index=trueIn PDF document text
    • http://turuduje.epizy.com/59572898503.pdfIn PDF document text
    • http://zuvaxazalafes.epizy.com/69619288900.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_off0000e4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A8 5736 bytes
SHA-256: 1f8c8036a70db86b6f05e750f8ca6d4e95c27896f8810fb0cf2c4f456399ff3f
font_01_sfnt_off0000f819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF819 10980 bytes
SHA-256: a0dd6bac6cfd689ddefe3340567b2feb65d5dca84e0489872100280d16155a51

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