Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eea77be75834dbb…

MALICIOUS

PDF

88.9 KB Created: 2021-03-13 23:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 29910adddc8cc1e25de3caf4882ce50e SHA-1: 4ac7954ba1984a2152300618dc7e2550f5548bf0 SHA-256: 8eea77be75834dbba94fbe6e89aa88626f4d57ec721140dbaf77f802b7ea2b74
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, suggesting it functions as a link farm to direct users to potentially malicious websites. The embedded content, though partially corrupted, references "trails of cold steel midterm answers", a common lure for phishing or SEO spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://bologen.ru/wix?keyword=trails+of+cold+steel+midterm+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386591/normal_604d2e8e93eb5.pdfIn PDF document text
    • https://latowinu.weebly.com/uploads/1/3/4/5/134508675/132a9a0cc5b.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/93828671816.pdfIn PDF document text
    • https://dejurepezuneron.weebly.com/uploads/1/3/1/4/131452785/puwinidagan-zugutarer-walazunaminet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497650/normal_6036e19d9416b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426822/normal_60174fcb3f742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_6041937d2e828.pdfIn PDF document text
    • https://cdn.sqhk.co/milevatomog/irhihi0/temple_spooky_jungle_run_oz_mod_apk.pdfIn PDF document text
    • http://talajudoxuxip.mygamesonline.org/divatizipujofuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392871/normal_6048a73d0574e.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/1ijOnji/champions_league_draw_simulator_last_8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498404/normal_5feb3d3220639.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/vavejix.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/comparing_and_ordering_numbers_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/30849182473.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 5208 bytes
SHA-256: fcd1cc8c44ada82d89d69a415e9f4b1db9bcb092f9a921fccb30cd38daa1396e
font_01_sfnt_off00011a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A73 11292 bytes
SHA-256: 4970c6228f49b0be6d1513124d49eb3ce6884f23655b35ab68cc13c092203d5a
font_02_sfnt_off00014117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14117 16132 bytes
SHA-256: 6c511cd2548aab1566dad8f54fccf2be4cd056cf5a4d5d56937977fde9165995

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