Malicious PDF — malware analysis report

Static analysis result for SHA-256 143475d1144f4a02…

MALICIOUS

PDF

83.8 KB Created: 2021-04-02 18:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b4ab3b8d604cb02709bac5101f08335c SHA-1: 09f509bb936fc8f83fb9f1ac4db326adb24a1f76 SHA-256: 143475d1144f4a026587fbc3cd1b62cfff4440c55c785ba1711a5593af71e84a
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One URL, 'https://nipisod.ru/123?utm_term=secure+folder+apk+for+oppo', appears to be a primary lure. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of creating numerous links to potentially malicious or low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/123?utm_term=secure+folder+apk+for+oppo PDF link annotation
    • http://yazansoft.com/mawojavumxuv1m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444626/normal_5fd046ed8223d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488815/normal_6048337a41c83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_601a17cdcf796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452835/normal_600d605aa2f46.pdfIn PDF document text
    • https://fomoxizukewoviw.weebly.com/uploads/1/3/0/7/130739072/xukoraxawafotugit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394061/normal_601756720e997.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/safety_hazards_in_the_workplace_examplesbfltg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_602ec2ae56d00.pdfIn PDF document text
    • http://100p-f.ru/rajenetuvenotedusowidy7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489730/normal_6045e3a0b6b46.pdfIn PDF document text
    • http://netlysy.online/12807876128ee03g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488323/normal_6010b56c68c55.pdfIn PDF document text
    • http://xarubuxa.iblogger.org/tata_motors_ltd_annual_report_2018-_19.pdfIn PDF document text
    • http://feelslike35.com/vitavijabedaja3qcuf.pdfIn PDF document text
    • http://ropikapusofune.iblogger.org/mardi_gras_mask_craft_template.pdfIn PDF document text
    • https://tuwowezofe.weebly.com/uploads/1/3/0/7/130775341/fobawo.pdfIn PDF document text
    • https://fewedujaso.weebly.com/uploads/1/3/1/1/131163653/c9639d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452389/normal_60123dd6743ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485153/normal_605516d336810.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sawopigemon.epizy.com/linux_antivirus_software_free.pdfIn PDF document text
    • http://putazosaw.epizy.com/1516114836.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 4788 bytes
SHA-256: e12383b8aca2654e7cc10a33130126353f745b4451de998693cd2a95910c2571
font_01_sfnt_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 11680 bytes
SHA-256: be1211e760be39fe70b8f702eabd3dff63887eacbd3bb15e1ee58adef6274c4b
font_02_sfnt_off00011bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEA 16220 bytes
SHA-256: 3927553ad056e6a6001d84d1a4bb070fa0753c5e1110d0c244af727dfd9b5ef0
font_03_sfnt_off0001313c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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