Malicious PDF — malware analysis report

Static analysis result for SHA-256 6589a80796960021…

MALICIOUS

PDF

73.2 KB Created: 2021-06-10 12:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 231f3e2442b2977094495c5622c558b2 SHA-1: 7ab2f99e46ba45706ac05efc4936b541ee7b6b10 SHA-256: 6589a80796960021b7385522bdef72efabdfc52de1212d72e0cf4e69901dad66
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, suggesting it's part of a link farm designed to manipulate search engine results or redirect users to potentially malicious content. The primary URL observed is https://archism.ru/pbw?utm_term=plus+messenger+movie+download, which appears to be a lure for downloading content. No scripts were extracted, but the PDF structure itself is indicative of a phishing or content-luring scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://archism.ru/pbw?utm_term=plus+messenger+movie+download
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/1661e20147a83.pdf
    • https://xuxerativizujaf.weebly.com/uploads/1/3/1/0/131070719/zutudoramo_gipizin.pdf
    • https://nelajelax.weebly.com/uploads/1/3/2/7/132712676/xijasipuw.pdf
    • https://dukinuvofipul.weebly.com/uploads/1/3/2/7/132711936/lowidasipinow.pdf
    • https://jokimaxe.weebly.com/uploads/1/3/7/5/137513409/gunupe-dezaronifoga-meposegotig.pdf
    • https://gajaxaja.weebly.com/uploads/1/3/2/7/132712369/paxuzegupu-tefujalilifumij-levejiwes-rokatesuzitiko.pdf
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/vimetorelifek.pdf
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/sozevapirimitom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ruxafonan.pbworks.com/w/file/fetch/144490461/promo_codes_for_speed_simulator_x_2019.pdf
    • http://pilujibos.pbworks.com/f/wuxurunigetemuxofipan.pdf
    • http://rotulenixal.pbworks.com/f/2pac_keep_ya_head_up_free_mp3_download.pdf
    • https://uploads.strikinglycdn.com/files/6fad6cc0-97b9-44c9-af59-af674ae40b04/96141201461.pdf
    • https://uploads.strikinglycdn.com/files/83dba568-b5e9-431f-98b7-d2a44187c80d/forgotten_realms_timeline_5th_edition.pdf
    • http://jozeluwofe.pbworks.com/f/perumivamofilukip.pdf
    • http://farejutotej.pbworks.com/w/file/fetch/144575457/how_to_download_toca_lab_for_free.pdf
    • http://sukagafamo.pbworks.com/f/118_elements_and_their_symbols_and_atomic_number.pdf
    • https://uploads.strikinglycdn.com/files/4f2d845d-500a-49d1-93a4-598b194feb5e/9451449255.pdf
    • http://mujefapufefi.pbworks.com/w/file/fetch/144516399/gametes_formed_from_aabb.pdf
    • http://ziduzobif.pbworks.com/f/38505784315.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_off0000e27e.bin
9723e8cdef36f18fa2c8940673707c97f52bfb766dd962a0133fd9e328785786		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE27E 5296 bytes
font_01_sfnt_off0000f47b.bin
11280c4ca6311158b0924e43f01c50dae3241b33a6eb2eb376b54ca2dff16459		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF47B 10344 bytes

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