Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc6b05c3caaa22a…

MALICIOUS

PDF

77.6 KB Created: 2021-05-27 11:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4db311cc9428b73c6ce7766e67ac0a8d SHA-1: f8b16282362344865ee22ac7784dfb83a6b2e06e SHA-256: 1cc6b05c3caaa22ace0c56c0002b4f0722d4e176e0a7d79dcaa44fe361f1aec1
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded external links, including one to 'baarspo.ru', suggesting a phishing or link-farming attack. Although no scripts were explicitly extracted, the presence of numerous external links and the overall detection profile indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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
  • 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://baarspo.ru/wb?keyword=dewalt%2020v%20max%20cordless%20drill%20combo%20kit%20brushless
    • https://pofisuxix.weebly.com/uploads/1/3/4/0/134016862/kugudexiratena.pdf
    • https://cdn-cms.f-static.net/uploads/4495391/normal_60613ebda3075.pdf
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5fd26fc137d22.pdf
    • https://wabaxudazisivi.weebly.com/uploads/1/3/3/9/133986682/8455828.pdf
    • https://cdn-cms.f-static.net/uploads/4402289/normal_604509e169b7a.pdf
    • https://cdn-cms.f-static.net/uploads/4380707/normal_5fd625bcd5eee.pdf
    • https://naboparukoxe.weebly.com/uploads/1/3/3/9/133997388/e9926bf4.pdf
    • https://winomawapaba.weebly.com/uploads/1/3/5/3/135334931/sefikoluxik-kuzijevag-voripuselopoxon-rutaji.pdf
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/7686080.pdf
    • https://cdn-cms.f-static.net/uploads/4498678/normal_606559f9cdd15.pdf
    • https://static.s123-cdn-static.com/uploads/4470412/normal_5fce502de3df3.pdf
    • https://cdn-cms.f-static.net/uploads/4409098/normal_602302915dd63.pdf
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5fcb1ded1d7d2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ebe69b4c-9c24-422c-a61c-6c38ebf9f574/how_to_grow_taller_exercises_for_better_posture.pdf
    • https://uploads.strikinglycdn.com/files/02bd3b08-78e7-4ee1-af28-073b45d10d2d/why_are_there_so_many_conflicts_in_africa.pdf
    • https://uploads.strikinglycdn.com/files/1a77115e-47cc-4675-8888-7711d427bb1d/science_of_mind_magazine.pdf
    • https://uploads.strikinglycdn.com/files/b81ddb67-23de-46d7-bc6b-d0a91c3109ab/loletolino.pdf
    • https://uploads.strikinglycdn.com/files/63d0968a-7aa3-41c9-9a43-b7ce0dc6a866/briggs_and_stratton_repair_manual_free_download.pdf
    • https://uploads.strikinglycdn.com/files/f1ef6f0b-5be9-43fd-8a61-742ca2fcacc3/29270436760.pdf
    • https://uploads.strikinglycdn.com/files/74584218-2aa8-41f8-b5a1-441a6100cfb0/fulasogenazuvow.pdf
    • https://uploads.strikinglycdn.com/files/1a438689-26e5-4408-b886-f702e0f40b41/87866654493.pdf
    • https://uploads.strikinglycdn.com/files/e408b764-2bc1-490d-b2ff-52e44a4176e0/george_beverly_shea_id_rather_have_jesus_story.pdf
    • https://uploads.strikinglycdn.com/files/8eb623dc-67c5-493b-8525-a8a5c40d0403/30588119176.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_off0000ef1b.bin
dd80cfba7e20ce1093d92b688d95332c6de3f3fcc02fbaa49b24ea7ff5dd5d06
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 5876 bytes
font_01_sfnt_off0001030c.bin
7abe4f800c9cd40fba18085e6a5c94f53ecd6b025604ee4aee887590da9f2607
pdf-font-stream PDF embedded font (sfnt) at offset 0x1030C 11164 bytes