Malicious PDF — malware analysis report

Static analysis result for SHA-256 af84d13778992c10…

MALICIOUS

PDF

68.7 KB Created: 2021-02-19 02:00:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e6fd242726602c4a70bbd96e4c29012e SHA-1: 93db4f9313d121b3d244a939293b554c037d5218 SHA-256: af84d13778992c10a37c0afd5766e1898fb332a8ca63a8da5ea0b993e1290b11
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The presence of multiple external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's primary purpose is to redirect users to potentially malicious or unwanted content hosted on these numerous domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/123?utm_term=little+prince+quotes+stars+death PDF link annotation
    • http://womenit.space/72050766299bdhqs.pdfIn PDF document text
    • https://wugumura.weebly.com/uploads/1/3/4/6/134601103/wowifim-ramenoj-febupavobif-lofogop.pdfIn PDF document text
    • https://tonogedufeji.weebly.com/uploads/1/3/4/3/134378200/limemawifodisu.pdfIn PDF document text
    • https://negozikazaseju.weebly.com/uploads/1/3/4/5/134587396/pixetidawoniri.pdfIn PDF document text
    • https://timelasabo.weebly.com/uploads/1/3/4/3/134345700/gugomimevokoso.pdfIn PDF document text
    • http://rat-red.space/make_ice_cream_with_almond_milkkh0iz.pdfIn PDF document text
    • https://gamevuwi.weebly.com/uploads/1/3/4/5/134525912/7577654.pdfIn PDF document text
    • http://kifenefazujiz.iblogger.org/breach_of_contract_complaint_florida.pdfIn PDF document text
    • https://pazarufawituxib.weebly.com/uploads/1/3/4/0/134000032/naluvikiwuxekos-gifitonovuf.pdfIn PDF document text
    • https://betetitowuti.weebly.com/uploads/1/3/4/3/134331261/8854a21.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://metusajixano.epizy.com/utorrent_free_for_android_mobile.pdfIn PDF document text
    • http://nagukubuliduz.rf.gd/the_lake_isle_of_innisfree_ncert_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/70500134741.pdfIn PDF document text
    • http://zazuxevepiz.rf.gd/replacement_biometric_residence_permit_brp_rc_form.pdfIn PDF document text
    • http://wunilos.epizy.com/yusuke_guide_persona_5.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF61 5228 bytes
SHA-256: 5623d4f5a91d145d028eb92f136074788bdd5f43f75e318e9c050ca91b613096
font_01_sfnt_off0000e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 10948 bytes
SHA-256: 64c43d4756215c34c8651572d7fd8822a52bd5c28d3c1af3eaf4428311cea9b5

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