Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72dbf93b8e14702…

MALICIOUS

PDF

103.5 KB Created: 2021-03-20 10:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f3a75799748ba57989037d2481c0a194 SHA-1: ef08a5425f70151c652081d00bb295809f94d540 SHA-256: c72dbf93b8e147024d607093eb21bc2677b910747fc49a97b578a8dfb813a309
192 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the document as malicious. The document body, though heavily obfuscated, appears to be a lure related to a game guide, which is a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/wix?keyword=swtor+jedi+guardian+stats+guide+6.0 In PDF document text
    • http://thecabinets.xyz/34471605639lxe42.pdfIn PDF document text
    • http://ijmalan.xyz/88083667223ygtn0.pdfIn PDF document text
    • http://bestplacefor.rest/quarterly_stock_reports_todayh6m9x.pdfIn PDF document text
    • http://mainsale.info/kadebufubesaxekesx08y7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465252/normal_603798ec3a873.pdfIn PDF document text
    • http://autokenn.com/915659161015lgv7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496816/normal_60176a9d73288.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374374/normal_5ff66b3875e74.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/attribute_changer_portableykcyb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466680/normal_5fe29dc259820.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367624/normal_5fecadc3c37b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_6021f86b8af4f.pdfIn PDF document text
    • http://budivev.scienceontheweb.net/37412520511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449004/normal_600f75f0a8da6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469106/normal_5feff1f0db7b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nemenarubaz.atwebpages.com/saranupi.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_0e284937c92f455190ff8179267fce09.pdf?index=trueIn PDF document text
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_f0dd9cfa4cab4c659b5e3222063f0584.pdf?index=trueIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_4bfe061676a7438684a99b33d8093ed0.pdf?index=trueIn PDF document text
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_eb8ab966231c4a95a74ebec586f0e6d9.pdf?index=trueIn 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_off00015730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15730 5560 bytes
SHA-256: 31a8dae7fae9ac85f6654df72673026d49af12709b30c7950f71b01b1d276e24
font_01_sfnt_off00016a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A46 11368 bytes
SHA-256: c1b166b2a7f4d1704f588bf0d38792f2b5362ccf9c0d9e79f910fb7dcaf6240f

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