Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8486b32446ad58…

MALICIOUS

PDF

67.6 KB Created: 2021-05-09 23:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d5083e57536329fa454eca822f1263ab SHA-1: 7402d88081ad872e9981e7696987012f48a7e99f SHA-256: 8a8486b32446ad58c146222ff6dde9716c7d8816a7e73dded3cdb20f5e92a729
186 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. One prominent URL, https://gimoguvi.ru/strik?utm_term=2005+mercury+optimax+225+service+manual, is likely a lure to a malicious site. The document's structure and embedded content indicate it's designed to redirect users to potentially harmful external resources.

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://gimoguvi.ru/strik?utm_term=2005+mercury+optimax+225+service+manual PDF link annotation
    • http://ninefukesat.iblogger.org/einfhrung_in_die_politische_philosophie.pdfIn PDF document text
    • https://kaxunuruji.weebly.com/uploads/1/3/4/7/134725802/f3587b9c7b5254.pdfIn PDF document text
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/6cf54.pdfIn PDF document text
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/xisuref_xexuzavipegaloj.pdfIn PDF document text
    • http://jijagigipijum.iblogger.org/aswath_damodaran_on_valuation.pdfIn PDF document text
    • http://pexaxasub.iblogger.org/49422704806.pdfIn PDF document text
    • http://wuzivigufeg.22web.org/45191466227.pdfIn PDF document text
    • https://tazabojadikeze.weebly.com/uploads/1/3/4/6/134648043/5066750.pdfIn PDF document text
    • http://kirivil.iblogger.org/lodikuvesowe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f5fa216c-c618-4dfb-b14b-efc64ff1fdf2.filesusr.com/ugd/0bcf16_ee3c597823694b159525006f1c97581d.pdf?index=trueIn PDF document text
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_188162888a384399a735092c6c7a96e6.pdf?index=trueIn PDF document text
    • http://jinisobijeg.rf.gd/balanceamento_quimico_exercicios_resolvidos.pdfIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_5540efd2fc4141c88042218f7448f3b4.pdf?index=trueIn PDF document text
    • http://dukojalili.rf.gd/felewowisabezolegagu.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/orbit_model_57894_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/sony_bdp-s3100_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/how_to_run_java_gui_program_in_eclipse.pdfIn PDF document text
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_19ba7a4c22eb4fbaa7284215978827e5.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_off0000ca33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA33 5612 bytes
SHA-256: 1df8fe76e5859d97b5e492df8e0cb044213bf1afc3d178cc4490b91a6e6ff5c7
font_01_sfnt_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 10048 bytes
SHA-256: 3ef7f30050904cabc32cf4ad3ca68eb4a8c64be1215d7aa30d1badc4cd1efb82

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