Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43fadfae6983c37…

MALICIOUS

PDF

91.9 KB Created: 2021-03-07 07:41:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 64baf3e7b8006a7a491fd21bde4d22aa SHA-1: 1737152e1dec0f866480813fcaf44c350f28aaee SHA-256: b43fadfae6983c371bcee827e5a3a3052cd588916ea6c758e9d94675f87fac8d
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 0.9998

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://lozipotod.ru/strik?utm_term=dixie+chopper+zee+2+54+for+sale PDF link annotation
    • https://zodaribidibukez.weebly.com/uploads/1/3/4/7/134716266/fopakuvebevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448343/normal_6022b48f5de66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467926/normal_600b7a77eddf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402261/normal_603337a911a6b.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/gijffif/14774619904.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/NfPhaia/gotofifanejib.pdfIn PDF document text
    • https://lemitixodage.weebly.com/uploads/1/3/4/8/134868200/dagemuxulanes_tepijuzudom_zumixoroje.pdfIn PDF document text
    • https://fazizutedo.weebly.com/uploads/1/3/4/7/134768054/edf80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5fd37cd209bd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465564/normal_60415748193f6.pdfIn PDF document text
    • https://cdn.sqhk.co/jabuvilir/isggihJ/financial_services_professionals_network.pdfIn PDF document text
    • http:///\\\/twitter.com\\\/MowersDirect\,\icon\:\icon-twitter\In PDF document text
    • http:///\\\/pinterest.com\\\/mowersdirect\\\/\,\icon\:\icon-pinterest\,\title\:\Pinterest\},\YouTube\:{\href\:\https:\\\/\\\/www.youtube.com\\\/user\\\/MowersDirect\\\/\,\icon\:\icon-youtube\,\title\:\YouTube\},\Instagram\In PDF document text
    • http:///\/www.bbb.org\/chicago\/business-reviews\/industrial-equipment-and-In 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/6998b3fe-8e44-4903-9026-fbceeca2175b/89994200849.pdfIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_bcec245ba5a6448aa48294c50bdc0fb6.pdf?index=trueIn PDF document text
    • https://04c6d2be-b5ec-470f-8655-bdc68d6defec.filesusr.com/ugd/3bcfef_fd42cb60ed5d4991899096550845570b.pdf?index=trueIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_67548863244e4295883f7f2db6237665.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ca291da-99f8-46a1-ba5b-b8bce9f0c666/14922347053.pdfIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_6910b3e2bd7f467187a4be1e60695b31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88c36f9-8871-4a5f-97ab-4988a69c7150/pesizifidane.pdfIn PDF document text
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_4231990eb7454120a870197ba78d54c2.pdf?index=trueIn 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_off0001258a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258A 5564 bytes
SHA-256: 794ad3fc2326aebe3d23d113b5c55564d41c5c7d67f778ea09d6d8a62677d9a4
font_01_sfnt_off00013895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13895 12372 bytes
SHA-256: 5a61df102930021a3049c96806c9b1046410d9e650c248095cd49be500eabea7