Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3650b7d503fe4f…

MALICIOUS

PDF

98.3 KB Created: 2021-02-17 17:08:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c307637ef113655e00c0745b3c3bc578 SHA-1: bd4fa56550e14983b0f2ba12b5bc755537db94c7 SHA-256: 6e3650b7d503fe4fb1c48ac0afd41b54be074b94612ed4f74499bdbebaa33e22
186 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to host numerous external links. The presence of a large number of links, many on disposable hosting and some with UTM parameters, strongly suggests an attempt to redirect users to malicious sites for phishing or malware delivery. The document body itself is heavily obfuscated and contains metadata from wkhtmltopdf, indicating it was likely generated programmatically for this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://leonvi.ru/123?utm_term=joseph+campbell+the+power+of+myth+full PDF link annotation
    • https://bikonate.weebly.com/uploads/1/3/4/7/134715396/3574356.pdfIn PDF document text
    • https://bonomomu.weebly.com/uploads/1/3/0/7/130775928/49d1f0f87b89b1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403140/normal_5fe1c18460031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492245/normal_600e65ffc1034.pdfIn PDF document text
    • https://vususutuf.weebly.com/uploads/1/3/4/6/134634118/3097055.pdfIn PDF document text
    • https://gugakelu.weebly.com/uploads/1/3/5/9/135965899/1097417.pdfIn PDF document text
    • https://gefozusep.weebly.com/uploads/1/3/5/3/135346228/6521252.pdfIn PDF document text
    • https://jerolukemotib.weebly.com/uploads/1/3/0/8/130874115/e2ae495c.pdfIn PDF document text
    • http://cetop.xyz/63078888879e19lm.pdfIn PDF document text
    • http://phtech.site/carnival_games_ps4_review_2018kj6gf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418370/normal_6003ce7547436.pdfIn PDF document text
    • https://motawifuliwax.weebly.com/uploads/1/3/3/9/133999363/vuxubitoz.pdfIn PDF document text
    • http://pimolala.22web.org/admission_form_template_bootstrap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402944/normal_5fe2143284b86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bogijexu/cisco_ise_2._4_hardware_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/eclipse_indigo_java_8.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/home_automation_icons_free.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_off0001448a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448A 5580 bytes
SHA-256: ba6dc90d9f2175499b53c02d37dcbbfb9c53ade5b6069c65e2fd2328434d63c1
font_01_sfnt_off0001576a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1576A 10776 bytes
SHA-256: 0b6139af125b7076cbf9b4a88caa479e6220e3662294320b1bbbbb513a642dc2

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