Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33e2fe05700caa3…

MALICIOUS

PDF

82.0 KB Created: 2021-05-30 07:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdb0d86a666ea9119778c6335a9bacb0 SHA-1: e7f2dd9b9122128b94bf7dc2fb2faff4901981f2 SHA-256: f33e2fe05700caa37c45cf2d3e85b12783e5d22b9dbff000602fa2ececd45045
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs point towards an attempt to redirect users to potentially harmful sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=sphax+purebdcraft+minecraft+pe+1.14.1
    • https://nepujegoxamo.weebly.com/uploads/1/3/4/3/134380276/poboxijavak-guvusatifona-wetesupigis-borudoduxe.pdf
    • https://static.s123-cdn-static.com/uploads/4402247/normal_6009687287cae.pdf
    • https://safanopoxave.weebly.com/uploads/1/3/4/4/134461162/panexaxipoduve_dakofanuvozobaz_mesajej_nivozij.pdf
    • https://static.s123-cdn-static.com/uploads/4372673/normal_5feb963fdca90.pdf
    • https://zukifetev.weebly.com/uploads/1/3/4/7/134725253/tavapuk.pdf
    • https://weziriditovi.weebly.com/uploads/1/3/4/1/134108838/vupifutifawaxosu.pdf
    • https://zedowegekinusil.weebly.com/uploads/1/3/3/9/133997302/030644bde3.pdf
    • https://teduraxiwerul.weebly.com/uploads/1/3/2/6/132681384/dajalez.pdf
    • https://dikubone.weebly.com/uploads/1/3/4/6/134603537/c54728ba328.pdf
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/fanagoxana.pdf
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/gurijotipoluku_sibumokikun.pdf
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/7543058.pdf
    • https://cdn-cms.f-static.net/uploads/4447098/normal_606b73536ba8e.pdf
    • https://kekebamifibem.weebly.com/uploads/1/3/1/6/131606854/wuxiwubotitemo_bojakexuwe.pdf
    • https://xalakadumikimam.weebly.com/uploads/1/3/1/4/131437423/9981102.pdf
    • https://noxojinuk.weebly.com/uploads/1/3/4/4/134479051/wobijiravode_nejiwarilavo_pofadafo_gonumelibibugux.pdf
    • https://cdn-cms.f-static.net/uploads/4497082/normal_606d949353e41.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e4fa9ce6-ff07-4623-b3d6-af94171574c6/lg_model_lfx31925st_parts.pdf
    • https://uploads.strikinglycdn.com/files/33330c14-5fa6-4ba4-8e23-e4feb78aa73d/know_understand_do_lesson_plan_template.pdf
    • https://uploads.strikinglycdn.com/files/9b362d56-dbb1-40cc-acba-f815297d8caf/how_do_i_check_cpu_usage.pdf
    • https://uploads.strikinglycdn.com/files/a04038b0-d1bd-4af7-9431-5610bcca0ea9/xemuvevewalogimav.pdf
    • https://uploads.strikinglycdn.com/files/90793653-6302-4138-8aff-d60a22f9ca40/70704645162.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd77.bin
d24217bc724ec4bc5c41213fbd3012968f12cae7e32e5040aa3fd6a4252de437		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 5668 bytes
font_01_sfnt_off000110aa.bin
eb2fef2769a8da88951b1ae43cb3d63b5339cdca7e96208b39d0bd2c160d232b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110AA 12708 bytes

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