Malicious PDF — malware analysis report

Static analysis result for SHA-256 1173474999ad7079…

MALICIOUS

PDF

97.5 KB Created: 2021-03-26 08:30:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: fc6ccccfef84ba8e3fd77178d796f65e SHA-1: 5e02879c6fa883af8752c8a152e5717109dd653b SHA-256: 1173474999ad70790fa0f666a60eb7649c0e0e78a1e65bb5c62c0c4c7d23f106
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

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://golowaki.ru/award?keyword=automatismo+mental+clerambault+pdf PDF link annotation
    • https://cdn.sqhk.co/rinovizifim/fjefEid/strategy_games_2020_android.pdfIn PDF document text
    • https://cdn.sqhk.co/fozuwasixeja/ARIPiay/plumber_pipe_fitting.pdfIn PDF document text
    • https://kulegireketo.weebly.com/uploads/1/3/5/3/135325025/aec554a.pdfIn PDF document text
    • https://mateboxabivof.weebly.com/uploads/1/3/4/7/134763458/kakigafuwum-sufagebe-vamukolufit-puzirovotezere.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/ieWfjgE/84742290716.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/aCQhiOI/xozokogoxefifimuj.pdfIn PDF document text
    • https://cdn.sqhk.co/gorubabor/jhIgfjf/the_mars_movie_download.pdfIn PDF document text
    • https://zitudoxe.weebly.com/uploads/1/3/1/4/131437236/8955424.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/TL7jgjb/98672945153.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/rLifRjh/24222877597.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f103cb64-b749-4fb5-a83e-7bb7f0e3ffb7/tres_metros_sobre_el_cielo_3_online_sa_prevodom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87c3b295-9cef-412b-8fd9-5529e3388703/59740295422.pdfIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_7ecc3d71fa8b4c51a838e272483a864a.pdf?index=trueIn PDF document text
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_b52759717ac14911a3843a088a612d21.pdf?index=trueIn PDF document text
    • http://gepopimasirepav.rf.gd/formation_aide_familiale_liege.pdfIn PDF document text
    • https://ad646471-8556-449a-8150-55a6f6ff724f.filesusr.com/ugd/7a1c5b_b0f3c36dbdf44131bf21109d69014875.pdf?index=trueIn PDF document text
    • http://bunakakivukutus.epizy.com/ruwoliritaputozufud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c76171-43f6-4b07-aaba-0adc6393d072/simuruwijubepal.pdfIn PDF document text
    • https://0bc2ebcf-5b85-435c-8290-6c6350a165f2.filesusr.com/ugd/ee98f5_26fd54794f854ca59091b2dbe2cbcc81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c98d364-2960-4947-bb61-dbe608b5ba49/clep_college_composition_practice_test_1_answers.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_off0001250e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250E 5432 bytes
SHA-256: 29a1b23e66eb479fb0ae1a69bd201896d18cf253d541c4c1b71c6473994d7c69
font_01_sfnt_off00013765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13765 13812 bytes
SHA-256: 87c97710ea4a005cbc8506f8cd50f7a8b4052d2dc41c4981559abf0d3a0f8502
font_02_sfnt_off0001611c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1611C 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e