Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bd7b4a89c42a7a…

MALICIOUS

PDF

73.0 KB Created: 2021-01-12 14:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5dfc8f934a353ba68a92ba827188a22 SHA-1: 28de5aa11065db0179fe361a2a59c1ceab5e9225 SHA-256: 18bd7b4a89c42a7af3cca9a4b896e1e87bc4ff89b5c7b07eed8d4cdb7335ccb1
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to link farms hosted on Weebly and other platforms, suggesting a coordinated effort to distribute malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/123?utm_term=wireless+ceiling+speakers
    • https://wezukanedipewor.weebly.com/uploads/1/3/4/6/134602888/xawisodunasenov.pdf
    • https://cdn.sqhk.co/wuzutuse/zjfgegf/toca_kitchen_2_download.pdf
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/xiviku.pdf
    • https://bagosuberabuvi.weebly.com/uploads/1/3/4/6/134681771/314174.pdf
    • https://cdn-cms.f-static.net/uploads/4377935/normal_5fb2d938cb95d.pdf
    • https://gopufiraw.weebly.com/uploads/1/3/4/5/134590690/5863947.pdf
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/600efe96.pdf
    • https://static.s123-cdn-static.com/uploads/4477147/normal_5feb0b8c519ab.pdf
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/fabebegufisoxosofoma.pdf
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/d49d0057f58a2ef.pdf
    • https://cdn-cms.f-static.net/uploads/4377116/normal_5f959d6de1f47.pdf
    • https://cdn-cms.f-static.net/uploads/4417214/normal_5fd978ff8752a.pdf
    • https://cdn-cms.f-static.net/uploads/4483610/normal_5fc08492f1bf5.pdf
    • https://static.s123-cdn-static.com/uploads/4404745/normal_5fc8fc9d924a5.pdf
    • https://tebivozov.weebly.com/uploads/1/3/2/7/132740763/7690630.pdf
    • https://cdn-cms.f-static.net/uploads/4368225/normal_5fb9f983ea872.pdf
    • https://xezujexowesujol.weebly.com/uploads/1/3/4/5/134502134/4604626.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_off0000e158.bin
ec11b8e9bfcc7728f223695742358398953bb91aeb4c756efc1d0633857bcc81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 5180 bytes
font_01_sfnt_off0000f318.bin
28ff3caebdee551d1b05dd81434b805ce3f54ce6bfc40f1c4fa51f123ab46459		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 10444 bytes

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