Malicious PDF — malware analysis report

Static analysis result for SHA-256 c12466866585667f…

MALICIOUS

PDF

73.7 KB Created: 2021-03-24 12:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5ea53bc162a76053ab6eeebf5cc1eb40 SHA-1: 5e255a9d03b960fb6dad5275434d34d951307f62 SHA-256: c12466866585667fb33cd23fd799d44e348ae4555059700903285ec8ddbf0265
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ponafet.ru/award?keyword=traitement+bronchiolite+du+nourrisson+pdf PDF link annotation
    • https://cdn.sqhk.co/wizevomorofe/gjhgyUS/48001263350.pdfIn PDF document text
    • http://podarokinsta24.online/91218617459hlxvq.pdfIn PDF document text
    • http://pop-marketplace.ru/mugijodieqfmw.pdfIn PDF document text
    • https://cdn.sqhk.co/pefatipi/gehaijL/69181367651.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/37885060925.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/cGUoWjj/miralax_for_cats_hairballs.pdfIn PDF document text
    • https://cdn.sqhk.co/gugosobor/LphbD0B/kavufogevetotovi.pdfIn PDF document text
    • http://varnisvakq.ru/mr_bean_whistlers_mother_movie7vvce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c07b3cb0-7d4a-4e65-9c62-eb3bd0ce3b6b.filesusr.com/ugd/7560d5_23d897ff754b48e6b65206481a8887e9.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_bfa2e7a576914149b60d98a15068cf4d.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_94cc3dae18ae4009b562a65e4e1068a4.pdf?index=trueIn PDF document text
    • https://0108a07e-94d6-443d-bfa7-575dd38852ad.filesusr.com/ugd/756a01_b3a884818b684834879a4778ad4d2216.pdf?index=trueIn PDF document text
    • https://807eaacf-9fb6-4e16-bcb8-061395d1d132.filesusr.com/ugd/a3ef2e_ed0aed903e0b49e393c44c2d55843f26.pdf?index=trueIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_5904a90175f04c6ca98c9f60cb5d3c88.pdf?index=trueIn PDF document text
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_865196cefc864171a74dfff3efe58873.pdf?index=trueIn PDF document text
    • http://dowafirowelumex.atwebpages.com/rock_band_4_new_instruments.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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 5484 bytes
SHA-256: 60382924b174b6a8ed2863e2948817895059714a443bba72b7f75e8bdb10edaa
font_01_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 12196 bytes
SHA-256: 53de036df1716581a6390bb20dc7340b18966cb95121eb074b70ae2f90845986

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