Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcc76f86a1cf994…

MALICIOUS

PDF

84.3 KB Created: 2021-06-07 01:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 90a2e8187df709eea1316006ab55d6f6 SHA-1: c8cee55c9d88586659a8cf50a17e705a485aadc3 SHA-256: fbcc76f86a1cf9942c543b72f8e857a5c271e2ac1d6dd75c82e9b481692fb84f
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 0.9997

Heuristics 6

  • 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 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=abilene+reporter+news+paper+obits PDF link annotation
    • https://noribazab.weebly.com/uploads/1/3/1/8/131871745/gusajiraxi.pdfIn PDF document text
    • https://padabomax.weebly.com/uploads/1/3/4/6/134681696/toferalasodipuzum.pdfIn PDF document text
    • https://gabinomila.weebly.com/uploads/1/3/4/7/134763369/tevekur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452373/normal_600bd105a6ff1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377120/normal_5ff105136994c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402951/normal_5fea3e55acf62.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/487950ba-c17f-4c5c-9a80-373c5a8c472d/raxebigikajeseluga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/520fefc9-c0c6-4ffd-8b25-42dcb3463947/75940596886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d17b672-dfdb-4a51-8a98-b6d6ce865187/how_to_clean_salt_chlorinator_cell.pdfIn PDF document text
    • http://vosebim.pbworks.com/f/download_zuma_deluxe_2_full_version_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a0bd82-5782-4039-84aa-21b13e651404/predator_generator_4000_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1839967-fc4f-4c3a-b6df-90d9ef66fad2/22956539062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57de6488-2dfc-443d-b591-f61a9fc1849c/how_much_does_a_dog_license_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a784a42e-ba62-40f3-9378-debf625a7b53/71588646077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a120a9c2-109b-4168-bd10-7a1085ee4381/xamisuwapesepaxisebobiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d957bb86-b231-4879-b956-aa1b97d91d10/timex_indiglo_wr_50m_manual.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/download_fashion_story_mod_apk_unlimited_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cfbb42b-b5b0-488f-a520-35045e29bfbb/49563783553.pdfIn PDF document text
    • http://togusan.pbworks.com/w/file/fetch/144427545/pezapekamezidobejejufapal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d861d65-594e-436d-973a-73998f258bdd/sly_flourishs_fantastic_adventures.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_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 5032 bytes
SHA-256: 49c6fedc68c298d71aff1d40ca5b1ef1565658b4b687eabe3c19e3679208d6b7
font_01_sfnt_off00011eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEA 10836 bytes
SHA-256: 979933c560a02994336d996bbc8e9f22bbfb722a18a169b6806bcc13be4a35cd