Malicious PDF — malware analysis report

Static analysis result for SHA-256 14800192ec6966d5…

MALICIOUS

PDF

78.7 KB Created: 2020-12-02 15:56:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3406bea0c79d5b05c9b139551130d11 SHA-1: 1244164c9a7dd6fc3dfce09ad69840b431230ba0 SHA-256: 14800192ec6966d54c5fa71d918aae8f59738556aec8305fffd40433fdd1b2ee
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was identified as malicious by ML classifiers and ClamAV, indicating it likely contains an exploit. It functions as a link farm, containing numerous external URLs pointing to other PDF files, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of multiple external links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • 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.
  • 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://trafftec.ru/123?utm_term=demon+slayer+water+breathing+tenth+form
    • https://munizifazu.weebly.com/uploads/1/3/4/3/134354015/5631866.pdf
    • https://naletonuve.weebly.com/uploads/1/3/4/3/134381452/7010118.pdf
    • https://xukoxaxap.weebly.com/uploads/1/3/4/7/134748194/4825293.pdf
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f9caa03a9c94.pdf
    • https://rofexelugikovu.weebly.com/uploads/1/3/4/7/134732340/36ad5.pdf
    • https://fuguxowaponiv.weebly.com/uploads/1/3/4/6/134648792/dokatakalososi-rotaxe.pdf
    • https://cdn-cms.f-static.net/uploads/4366982/normal_5f8783d0c1e98.pdf
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/kolelonetilekoxa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nazekisigiduz/majadivovenarimoluki.pdf
    • https://static1.squarespace.com/static/5fc1b5e47d0c8f249d467b8d/t/5fc78a6e788a962b7c326b59/1606912626016/kexazefujakugogupekojuje.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0be.bin
ebb30dc0903f9327f5b86af6e301a8eb2872fe6d7c76c01632f2928a00b8fdc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BE 11080 bytes
font_01_sfnt_off0000f505.bin
f2b4df645c3f512a2b687d650f36dab95f3193f086cb0980ff3970b202fe4d08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF505 5512 bytes
font_02_sfnt_off000107b6.bin
e83665101aefe7b3559b0e41e2172289749a9595b643e193a51e73cbd839efdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 11612 bytes

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