Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f3ae8a6d2ede02…

MALICIOUS

PDF

77.3 KB Created: 2021-02-20 09:19:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f5a420ab063ff413339e09231c2df116 SHA-1: dd9735aa857c3789247d127ea602ebd9b8f60a1b SHA-256: 85f3ae8a6d2ede025fe68a982c497865e640f2ce870d843f43d6910c62ffbee1
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to disposable hosting and appear to be part of a link farm. The primary URL suggests a lure related to technical support interviews. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or redirection to malicious content. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=technical+support+interview+questions+and+answers+for+freshers+in+tech+mahindra PDF link annotation
    • http://haifaiv.ru/electrical_wiring_residential_8th_editionxuyl0.pdfIn PDF document text
    • https://cdn.sqhk.co/gulanuwe/FjgghFM/wurudemujarigijino.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_6017a7e54bb82.pdfIn PDF document text
    • https://pijafure.weebly.com/uploads/1/3/4/4/134457855/lozitexevotidojafe.pdfIn PDF document text
    • https://sojagimizalafar.weebly.com/uploads/1/3/5/3/135317111/8492949.pdfIn PDF document text
    • https://xuwudivalef.weebly.com/uploads/1/3/4/8/134889087/simavokazoxefokenuf.pdfIn PDF document text
    • https://fofagova.weebly.com/uploads/1/3/4/3/134313529/rodarukiwipo-fetiwegutoxa.pdfIn PDF document text
    • https://gifivetusox.weebly.com/uploads/1/3/4/7/134736849/ganogisowegoma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_601f10127d407.pdfIn PDF document text
    • https://cdn.sqhk.co/simikimira/uyiiji5/juventus_fc_injury_news.pdfIn PDF document text
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/rebugu-notebumisoro-gifokav-dedurotojim.pdfIn PDF document text
    • http://invitesistem.ru/platform_games_ps4_2019cp332.pdfIn PDF document text
    • http://voduvalegef.66ghz.com/sojunuwijepubititev.pdfIn PDF document text
    • https://cdn.sqhk.co/koxuvusu/jQCge9W/lapomuwiwexikoj.pdfIn PDF document text
    • http://latomixoxa.iblogger.org/6391588087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443812/normal_5fe8a8c903e09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455684/normal_5ffc112fa0a3f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_5fd7c9f3a5015.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://konugatevokaxot.epizy.com/netflix_for_android_tv_7._1.pdfIn PDF document text
    • http://disiroto.epizy.com/sizarepawavakas.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_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 5620 bytes
SHA-256: 1ae775d2bcb95be2a655dd5db0449c6f1817353ca311a76368b24cb4db765a98
font_01_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 10828 bytes
SHA-256: 3baf83b15e8d6252900954aee936b7dd40b3d3d6f16e5a1936f78276b5b9b48e

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