Malicious PDF — malware analysis report

Static analysis result for SHA-256 0017a871bb7db9c6…

MALICIOUS

PDF

89.0 KB Created: 2021-05-14 20:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4bd8b068eb2462b21bf624dff8147d90 SHA-1: 97973a1669c16d260f7f8c74a53bfa83a97a01a9 SHA-256: 0017a871bb7db9c65e3a5bce43447f81161dc480e749ab842d272a59fbcfae82
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://zajinet.ru/strik?utm_term=what+positions+are+considered+middle+management PDF link annotation
    • https://zivexuxa.weebly.com/uploads/1/3/1/8/131871677/duvuzeguxu.pdfIn PDF document text
    • http://vereffka.xyz/how_much_money_does_an_amazon_author_makepymew.pdfIn PDF document text
    • https://rulovukefaz.weebly.com/uploads/1/3/4/7/134712077/5008664.pdfIn PDF document text
    • https://fiduwovizeget.weebly.com/uploads/1/3/4/5/134517619/rogatufen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486192/normal_5fe9d92e59652.pdfIn PDF document text
    • http://kulinar2020.site/sad_shayari_imagee29w9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425487/normal_6069154d35295.pdfIn PDF document text
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/kazotizupof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471946/normal_60570393d6e3c.pdfIn PDF document text
    • http://doordash.link/foduzelq315.pdfIn PDF document text
    • https://sufifova.weebly.com/uploads/1/3/4/7/134736026/vajutejosegeti_nowabujilataj.pdfIn PDF document text
    • http://bovibuvebus.getenjoyment.net/xibib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_60469a871b658.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://todiwefexoneb.atwebpages.com/38261466715.pdfIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_1dea2f0384854cddb4f51c939a32bc2a.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_da417b8461a64daab9944edcddde95ce.pdf?index=trueIn PDF document text
    • http://dilutibu.onlinewebshop.net/kusovixijelurawatigaves.pdfIn PDF document text
    • http://xufoziminep.onlinewebshop.net/31251299851.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10770 5500 bytes
SHA-256: 655928730d208baf0ea58f4a1e6603d8cc769d99cf4bbcc1ebde0584790ee5c2
font_01_sfnt_off00011a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A05 11568 bytes
SHA-256: 6df9b6ad45c6c2bacea23821f8ff2c2e533b15b1c2792166e8076d7b4a7804d0
font_02_sfnt_off000141a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A0 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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