Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94bea20d6d53470…

MALICIOUS

PDF

89.8 KB Created: 2021-06-11 09:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 969f6fccd81818bdbbe0c5f11f0a3928 SHA-1: 3c8ff1c46ef009e59345b883bf7a9d60b1a82ea0 SHA-256: f94bea20d6d53470f1162feb816be576acaa26f50d27dd9c8eb7cc8d33f98b5e
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the 'Download Button' heuristic further support the conclusion that this document is intended to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=election+card+form+6a PDF link annotation
    • https://jasezanita.weebly.com/uploads/1/3/1/6/131637239/rokused-togewe-nuvuvo-bunoserux.pdfIn PDF document text
    • https://rovunulaji.weebly.com/uploads/1/3/4/5/134529744/nisom.pdfIn PDF document text
    • https://vebupixe.weebly.com/uploads/1/3/4/8/134854050/6096d8f334605.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453908/normal_5ff5ce9b29f78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387054/normal_6043f4087ccd4.pdfIn PDF document text
    • https://zegabanibo.weebly.com/uploads/1/3/5/3/135339571/a7a7fd9f5.pdfIn PDF document text
    • https://gezumadugoviful.weebly.com/uploads/1/3/4/6/134611133/risola_vazeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_6049d0fb8c893.pdfIn PDF document text
    • https://wejorawifaloju.weebly.com/uploads/1/3/4/4/134458418/2233263.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/b0909c1fb840a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424637/normal_60665b98b74f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404299/normal_6003b3c61955c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff35ab8-fe51-47ca-be9c-9f3b2eb3707e/kulivef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d74202d6-9867-4d40-a477-f78724f87d12/huskee_rototiller_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/882fd4b2-a018-4060-b94a-2c6799b811b1/hp_laserjet_1320n_cartridge_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e2f51d4-af50-4635-8b65-535be8141296/how_do_we_use_progress_in_a_sentence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d2ad3a6-91d7-4000-adfe-da97eb56155d/tifijivaferelel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eaa25ce-f2ba-4737-bdb5-83722e3ff749/bose_remote_control_codes_for_lg_tv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 5100 bytes
SHA-256: 1262dff91281d620f12a555d234c8a37b69215424981eda903218c4997155b8b
font_01_sfnt_off00012027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12027 10728 bytes
SHA-256: 26e91a58dd9725ddf6bdb01a6f901f21bef97f0aa62447808795e12fab42948b
font_02_sfnt_off000144ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FF 5980 bytes
SHA-256: 1ddcbabac9089a7dea32d9593028d6adcf70cf1c092f8763f16193e69420717d