Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e71f838e1320d30…

MALICIOUS

PDF

75.2 KB Created: 2021-04-08 17:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f209bcfe3280350dac3d16665de05ff8 SHA-1: 271bd9665bde487bfa36c9b439d24523fadc4c28 SHA-256: 8e71f838e1320d3021abc4c4c2f75260e2828038d27ebe02e1d09670b4e1bd81
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to PDF files hosted on various domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate the document's primary purpose is to direct users to a network of malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=how+much+do+mobile+mechanics+cost
    • http://gufutaca1.xyz/39398849576bda1b.pdf
    • http://ital-girl.space/popefomatuzapamojamopuggwpb.pdf
    • http://loxigedu.iblogger.org/4495353574.pdf
    • https://xirabefutabo.weebly.com/uploads/1/3/5/3/135323672/bozegubinokad.pdf
    • https://pixadodo.weebly.com/uploads/1/3/2/7/132740612/d839c37.pdf
    • https://zanubago.weebly.com/uploads/1/3/4/8/134886268/wogifo.pdf
    • https://xuzomavarek.weebly.com/uploads/1/3/1/3/131383242/df6a91102230.pdf
    • https://ponukikoruxa.weebly.com/uploads/1/3/4/3/134343798/4427597.pdf
    • https://tevoletefe.weebly.com/uploads/1/3/1/6/131606261/6195193.pdf
    • https://kowenijog.weebly.com/uploads/1/3/4/0/134096242/figojagizujofo.pdf
    • https://janolonixo.weebly.com/uploads/1/3/3/9/133987325/wudolula.pdf
    • https://xugoxuxilolikat.weebly.com/uploads/1/3/4/8/134860817/kokewijan-nifirawefa.pdf
    • https://laziboxejebemu.weebly.com/uploads/1/3/0/7/130740401/e10e66cd79d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e3ba7771-1cf2-49b9-be81-d91832e8ed63.filesusr.com/ugd/bc9675_152c31de2b60493ea85b23ff8c372f1e.pdf?index=true
    • https://536432c6-7160-4795-b32c-faef63afc1c8.filesusr.com/ugd/5e2347_a948383c366d4f54bc9a01cfd56d90c5.pdf?index=true
    • https://s3.amazonaws.com/jidosatikim/jandy_pool_heater_parts_mississauga.pdf
    • http://lomigibowexalu.epizy.com/91357759997.pdf
    • https://s3.amazonaws.com/vosimalume/pamugukugomesenuvegufep.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_off0000e6a4.bin
b45d0c7b4721b1a7e0c580138529ea1275a65b948fb67b78d81c1bb5d469fa2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 5276 bytes
font_01_sfnt_off0000f877.bin
73ab261c2efd77ffce7ecab5d3a8e9cc358358ed18b6d4e02c875f70fe75dfcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 11052 bytes

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