Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc4e227fefd61c8…

MALICIOUS

PDF

77.9 KB Created: 2021-03-22 19:34:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5e2949e2a6bc63385df7af6796f3efd SHA-1: 09cf9753dc29c84c734b67688fe39c5739f1c952 SHA-256: 8bc4e227fefd61c8d1dd59f48a60fef5e9c8a9ec695be02f83449d02a8eacef3
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate content, a common tactic for SEO poisoning and malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be a precursor to delivering a password-protected malicious archive. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://golowaki.ru/strik?utm_term=programacion+neurolinguistica+tecnicas+pdf
    • http://copyright-notice-ig.com/chiari_malformation_mri_sequencesq0spq.pdf
    • https://lamonide.weebly.com/uploads/1/3/4/0/134096931/e94390ed.pdf
    • http://vesimawamom.66ghz.com/certificato_anamnestico_rinnovo_patente.pdf
    • https://vobinuxidixuf.weebly.com/uploads/1/3/4/4/134471365/leretolibu-robesuva-xatijumeg-zusosim.pdf
    • http://vikirin.iblogger.org/14128246869.pdf
    • https://mamubata.weebly.com/uploads/1/3/4/5/134598765/b4f0b0225957b.pdf
    • http://xtina.online/gofofae7ljt.pdf
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/xomeju.pdf
    • http://secret-empire.ru/fugafelevosojedanub164.pdf
    • https://jonexizuli.weebly.com/uploads/1/3/4/2/134235370/89642c9b00711ca.pdf
    • http://dehydratedoriginalgoodness.com/pioneer_avh-x3700bhs_firmware_updatenz1me.pdf
    • http://worldthailand.fun/71044847318dczkv.pdf
    • https://lefoxidegej.weebly.com/uploads/1/3/4/5/134526886/7a16e20.pdf
    • https://suzipokenefuju.weebly.com/uploads/1/3/3/9/133997801/vaxebereti-gosetegorolo-defiwiju.pdf
    • https://menuvinowit.weebly.com/uploads/1/3/5/3/135320060/4009226.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_e809ab9e527c48599145da2704314d82.pdf?index=true
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_f0ac0765e4414cca9a690f0309ddc25e.pdf?index=true
    • http://fukoter.rf.gd/xereradukaxifawobusasow.pdf
    • http://zarezelokuka.rf.gd/bofeloromezobosiwebefo.pdf
    • https://cb70cc59-2297-49c3-b7e2-2ac7e26e28d4.filesusr.com/ugd/4479ed_ec8bbb1bfafb45ca8904a24fc3a8c24f.pdf?index=true
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_6c8a343b51174b8b9bd592ed76dcea33.pdf?index=true
    • https://uploads.strikinglycdn.com/files/aacd2c46-f597-4da2-acb1-91a676c52d12/occupational_health_and_safety_books_free_download.pdf
    • https://uploads.strikinglycdn.com/files/20c1c720-0b87-43c8-9c00-3e060bffa453/are_there_any_recalls_on_2017_hyundai_sonata.pdf
    • https://uploads.strikinglycdn.com/files/56a0fcf0-5883-4959-8901-85c8f4dcb5d0/pocket_bike_pull_start_repair.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee81.bin
1f469d7807f7e59a0843e31e770065036d718915418b8a2a26ea4e537a2ed131		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 5476 bytes
font_01_sfnt_off0001010c.bin
31c17702c90c5f37662a674b749ea3c3a6881935d32fdb75095da2854dfc4332		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 12040 bytes

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