Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa93f1e6b6defa50…

MALICIOUS

PDF

74.7 KB Created: 2021-05-29 18:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 608d57458bf946f2b842a338bd3cac1a SHA-1: 5f61a17110f0be32d5984bc8592e982e14e177fb SHA-256: fa93f1e6b6defa50f0ace9ab17f1bf41410676499923c183ec2e76dc9f229adc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/123?utm_term=uww+wrestling+score+sheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456705/normal_5fd8090bca2d9.pdfIn PDF document text
    • https://remejatezikame.weebly.com/uploads/1/3/1/0/131070309/zagiva.pdfIn PDF document text
    • https://dawekemukodo.weebly.com/uploads/1/3/4/4/134491409/4f17d3a1.pdfIn PDF document text
    • https://kotimoxita.weebly.com/uploads/1/3/4/8/134878992/5060998.pdfIn PDF document text
    • https://bagamijak.weebly.com/uploads/1/3/1/3/131380043/4712290.pdfIn PDF document text
    • https://kidenido.weebly.com/uploads/1/3/1/6/131636891/7117780.pdfIn PDF document text
    • https://lugapageragije.weebly.com/uploads/1/3/4/6/134617753/baribejori.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413236/normal_5fef7798d4c12.pdfIn PDF document text
    • https://xubakoveg.weebly.com/uploads/1/3/5/9/135967212/5d514cf83a7.pdfIn PDF document text
    • https://keroxazoxap.weebly.com/uploads/1/3/4/8/134884937/3208153.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456982/normal_606c0c91b56a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444371/normal_60121af786996.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/653fb611-59b0-42e6-b2e1-2d1ce042cef0/tutoriales_visual_basic_2015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a844c9c3-f2a1-4ae2-9447-a8c6402614a7/mage_leveling_guide_ragnarok_renewal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5485504-9a68-4cd8-ab8e-6c4ca6caeff4/2016_kenworth_t680_cab_air_bag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4dd2d88-b62d-4565-a630-9f88cdee1214/elder_scrolls_the_infernal_city_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d848841-abea-40c6-86ec-a29f1cfa17a0/jowekodajomexukine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e2bf71-931c-435e-930a-597cdc36b391/kitowiwudozodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b18ba52-4b73-4276-b5b3-e95c0d182511/dell_latitude_e7450_specifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4705bb66-765b-46b4-aa87-daa6711ec8d5/61360921805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b14331d-345d-4b2a-938b-1400ed7ec52a/pirebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d712dffd-3c7a-4408-bf7f-7f90ca216e5c/24483506514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb6cb5d-3e4a-4692-b754-febdd5700551/togofawililopoke.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_off0000e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 4932 bytes
SHA-256: dc36d58f9d467d5d45bc020f99e3a3934164a61b1f6e6412f5d4b7e607e98b39
font_01_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 10684 bytes
SHA-256: 6e52dc7305df46e83c644ab19133eb0aa77863ca58bf693bd608a0438769a5c7