Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a81de90f165b47…

MALICIOUS

PDF

68.3 KB Created: 2021-02-23 10:01:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 97afb12c2dae45d32506be943aa2d9da SHA-1: 2cbbd8f0bc42aa35a0a580b5d0c7657476e69921 SHA-256: b0a81de90f165b47c0500bec66203c5f2b5ccd1018f07a1ef2af5288688ed3d0
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating it contains malicious content. It functions as a link farm, directing users to numerous external URLs, one of which is a known malicious redirector. The document body, though heavily obfuscated, contains references to search terms and application metadata, suggesting a lure for SEO manipulation or phishing.

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
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=jorge+luis+borges+quotes+about+death In PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_5fe7941650c8c.pdfIn PDF document text
    • http://canonsburglake.com/xifijokori8h.pdfIn PDF document text
    • http://yewes.fun/coordination_chemistry_problems_andapbak.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/ijWBha8/guxeketenetuvaje.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/hdjdLhd/juegos_retro_pc_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nijegonusas/ihVkjfO/togaxuvikisotavaburireva.pdfIn PDF document text
    • http://felidefewipikig.22web.org/17936829993.pdfIn PDF document text
    • https://rilulukopidu.weebly.com/uploads/1/3/5/3/135323077/5aeb1.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/kcgdcib/sujuvefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489834/normal_5fd29f58cec95.pdfIn PDF document text
    • https://cdn.sqhk.co/nopavoboriru/RIZjahd/procreate_fill_color_not_working.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/tifepopezezorujovijk9iri.pdfIn PDF document text
    • https://zukixuvaxetili.weebly.com/uploads/1/3/5/9/135988851/7696885.pdfIn PDF document text
    • http://sakhavto.ru/4335608309kie4.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_off0000cf1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1D 5340 bytes
SHA-256: fcfd876b06bac310dfcbe74e1a2bea91ee386c2c897f1affd0b70f48c2fa6e94
font_01_sfnt_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 10436 bytes
SHA-256: 8bfb536584eb92a4d6fd4cb3ad30dcf7d11f97e06117e64a52d19fdafc2dc772

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