Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e152193ce61e879…

MALICIOUS

PDF

70.9 KB Created: 2021-02-17 02:27:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3792d9b90ace749fd2afd4a61c86095c SHA-1: 5f7afe36f2550581feb2972e3fb7c8fc61700302 SHA-256: 8e152193ce61e879b3accef606999e3dc761e49d1090c2a31b4e01a6aa4e6595
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links pointing to various PDF files hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of numerous external links and the detection as a trojan strongly implies an attempt to lure users to malicious content or exploit vulnerabilities.

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://seumenha.ru/wix?keyword=sending+stone+pathfinder PDF link annotation
    • http://reduslim-ufficialesito.site/southwind_heater_manualzub1l.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/ibhcN0J/social_science_class_9_cbse_ncert_solutions.pdfIn PDF document text
    • http://yognat.space/high_carbon_steel_grades3pc5o.pdfIn PDF document text
    • https://cdn.sqhk.co/zisujidixa/giYwigM/48666787690.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/dhq0heq/29924484950.pdfIn PDF document text
    • https://zerakekume.weebly.com/uploads/1/3/0/7/130739742/770e4.pdfIn PDF document text
    • https://butadopol.weebly.com/uploads/1/3/1/3/131378795/xiwizug-padugemuva-zuson-kizisufugaduses.pdfIn PDF document text
    • https://menesifewo.weebly.com/uploads/1/3/0/8/130814293/c0f4fe8a2.pdfIn PDF document text
    • https://wumefabifu.weebly.com/uploads/1/3/4/8/134888429/2e6633c248.pdfIn PDF document text
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/9269572.pdfIn PDF document text
    • https://vutuwoti.weebly.com/uploads/1/3/4/7/134720014/9338960.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/9d16896115aba.pdfIn PDF document text
    • https://nirefuriwubava.weebly.com/uploads/1/3/1/6/131637308/9009820.pdfIn PDF document text
    • http://raisinsapp.club/jugabijobimakolokot2n3ya.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 5376 bytes
SHA-256: e73a48e96c8a7e3f201f5a2f9b77bd5925f27aa4b07fa213134886a65097dde0
font_01_sfnt_off0000eb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 10428 bytes
SHA-256: 2b65745701667a92852c6ea98e35f4bdd991b0c4680ec0576a4a940dc00798de

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