Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d73cfe05cbf4399…

MALICIOUS

PDF

76.3 KB Created: 2021-04-01 16:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2e200f12f6f5ba15ab679e5666083468 SHA-1: d64b48c5993a18b4f3da74a0211eaa4a9971a63f SHA-256: 8d73cfe05cbf439928d8982c4c1452def6e1a665f6702c237b58d97530f5def2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9511

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://xajibur.ru/award?keyword=apprendre+allemand+pdf+mp3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460972/normal_5ff2115a66085.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_603b7d8445879.pdfIn PDF document text
    • https://sinukofulav.weebly.com/uploads/1/3/4/6/134634738/jugakeronik-dubakiveroralen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445888/normal_6027e01264293.pdfIn PDF document text
    • http://kismyketio.com/how_to_replace_oven_door_glass_maytagy15by.pdfIn PDF document text
    • https://zirefugat.weebly.com/uploads/1/3/0/7/130740019/jenaketowoloni.pdfIn PDF document text
    • http://daravto18.ru/21133015541pm1fs.pdfIn PDF document text
    • https://nenilinuda.weebly.com/uploads/1/3/1/3/131383514/1211807.pdfIn PDF document text
    • http://romeita.space/pubg_mobile_hack_mod_apk_obbjcx5l.pdfIn PDF document text
    • http://gasolotiravizid.sportsontheweb.net/picsart_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416154/normal_5fce1138551f1.pdfIn PDF document text
    • https://nutifikidejuz.weebly.com/uploads/1/3/4/3/134347692/dumumugulej-mevolunuk-mewit.pdfIn PDF document text
    • http://rkconstructionsucks.com/burezubefawosobagivimador4r2pr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_6051e3b30dad0.pdfIn PDF document text
    • http://wersita.space/quotes_from_confederacy_of_duncest47o1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limufij.myartsonline.com/reported_speech_test_advanced.pdfIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_f85afafa0d614d8a8992856fda9e62a0.pdf?index=trueIn PDF document text
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_e4c7fd34b25e458393aa4ed1ce5040f5.pdf?index=trueIn PDF document text
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_c145ac080a0d45288cb1d3c8109c6066.pdf?index=trueIn PDF document text
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_5f44b67081a04f7ab438fd3c95056c87.pdf?index=trueIn PDF document text
    • https://108bb973-5399-4bf7-a70e-a18780752cac.filesusr.com/ugd/760a88_e935555684d84a5ba5c3bb09f0d7541c.pdf?index=trueIn PDF document text
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_7bcb94c932214f87a8ec66dcb1244afd.pdf?index=trueIn 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_off0000f188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF188 5164 bytes
SHA-256: ef8c94bbcd6c7aab5a1db40280ca62f410d5e66a616e762067ddc9a0501ab606
font_01_sfnt_off0001030c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030C 14068 bytes
SHA-256: 386e74f8449303ce0f6264fcc351e99509138ba20a9090882479b5356411ef79

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