Malicious PDF — malware analysis report

Static analysis result for SHA-256 a70be4f75c4b61ab…

MALICIOUS

PDF

69.3 KB Created: 2021-03-01 21:08:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 93c974fc5d30dcab807336c1bdecbc4f SHA-1: 9cd6928d7f2d7a5efa318beed6d40b5c76721ee2 SHA-256: a70be4f75c4b61abf13e58e62a70c84579362b275d55b42437044517179d4f32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://fokemale.ru/wix?keyword=ib+learner+profile PDF link annotation
    • http://guketaz.iblogger.org/dudotidenasimufuma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451039/normal_600e48da0fc8a.pdfIn PDF document text
    • http://tojokepolosuku.iblogger.org/kezosofunip.pdfIn PDF document text
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/sowejugesig.pdfIn PDF document text
    • http://subaxidubuju.22web.org/lugewesojoza.pdfIn PDF document text
    • https://xosulokut.weebly.com/uploads/1/3/4/4/134466674/7598711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454677/normal_6032efdae1e5a.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/remington_bolt_action_black_powder_rifle.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/what_is_the_best_carpet_cleaning_solution_to_buy.pdfIn PDF document text
    • https://xowitato.weebly.com/uploads/1/3/0/7/130776358/nuludolazamuja.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/quran_classes_online_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484812/normal_5fcb6fc00f406.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bijuwobekub.rf.gd/glencoe_biology_textbook_the_dynamics_of_life.pdfIn PDF document text
    • http://zuvujivir.rf.gd/32442916858.pdfIn PDF document text
    • http://zutagokakaki.rf.gd/92230821750.pdfIn PDF document text
    • http://jifobobaganut.epizy.com/bapeguxuxegonadatubamiv.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31F 4796 bytes
SHA-256: 3fc1a6f7926ef9e68f2ab552026110f5d846388ff63411c074cf38c8889371b5
font_01_sfnt_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 10740 bytes
SHA-256: f32f29080c95bcd4c67671ab75e6fa7d0d335720f1c2f6e7778a900d6bcfdab8