Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b885557edd0646…

MALICIOUS

PDF

79.7 KB Created: 2021-03-27 18:47:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 85d4ecdfceabeccce2dc19789f65efb6 SHA-1: 9450dc3c23b6833efd8e1721fb20d88f107e693a SHA-256: c8b885557edd064675c06408dda92688550e36f4b28ff7998c1e42fee3afd362
186 Risk Score

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 0.9992

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://leonvi.ru/wix?keyword=eso+deadly+strike+set+any+good PDF link annotation
    • http://wurilozi.scienceontheweb.net/pamawuritedukigopabo.pdfIn PDF document text
    • https://rawoxozuk.weebly.com/uploads/1/3/2/6/132695352/e9ceb26.pdfIn PDF document text
    • https://juxibawazorar.weebly.com/uploads/1/3/3/9/133997202/begodedidufepojav.pdfIn PDF document text
    • https://xizuxukavawot.weebly.com/uploads/1/3/4/3/134376570/493303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401973/normal_605c3e48dbf06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413361/normal_5ff37dcc85cb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408174/normal_6034f08688cda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409813/normal_5fe186ab7e724.pdfIn PDF document text
    • http://suzejejibazuv.iblogger.org/inverting_amplifier_definition.pdfIn PDF document text
    • http://lezirumari.sportsontheweb.net/wexanepipefam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_be06d276043e481ea583254ac0fea6be.pdf?index=trueIn PDF document text
    • http://vimitafukufes.rf.gd/safin.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/17004491327.pdfIn PDF document text
    • http://nibizuladode.onlinewebshop.net/gloomhaven_board_game_rules.pdfIn PDF document text
    • http://fuguzametekobo.myartsonline.com/14012095185.pdfIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_2c7a835930b24afc91e61507bc140b46.pdf?index=trueIn PDF document text
    • http://webezivoxubabo.epizy.com/fulalutozanusapa.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/advertising_flyers_templates_free.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_0c03e37f4e904070944a5627e291f605.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/sheet_pan_fajitas_budget_bytes.pdfIn PDF document text
    • http://wepogevadapafa.atwebpages.com/politique_sociale_dfinition.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/71820333351.pdfIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_a65149b1f946434f95ff3fed481ed948.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_off0000fbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE1 5116 bytes
SHA-256: a3e80d4ecac2197b2f95b958ba1f415add4cbd34819b90a6b3304609d697741e
font_01_sfnt_off00010d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 10544 bytes
SHA-256: f925042bf11048289e17ceff34275f26d945d8302b3efedeb4d7f8ed4bb6a3e6