Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcff2b9e22656cea…

MALICIOUS

PDF

97.2 KB Created: 2021-02-12 20:54:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e4d8b11e9c284ab1cc53326fa5fa2d0e SHA-1: d165c46784bf38351215c29362c49c329215747b SHA-256: fcff2b9e22656ceae27b5e3f61daedf682ec1978c02a9a03b82cf3c15580ce90
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to lure users to malicious content or phishing sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/wix?keyword=dark+heresy+alternate+career+ranks PDF link annotation
    • https://lozezuxugi.weebly.com/uploads/1/3/4/0/134016676/sazatat-lenanil.pdfIn PDF document text
    • https://wapofaxuza.weebly.com/uploads/1/3/5/9/135992917/wiwonapimese.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/6edecc9b72b54.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/gihiWhj/traffic_run_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/ggyha6Y/trending_hashtags_right_now_on_twitter.pdfIn PDF document text
    • https://zetozegazironik.weebly.com/uploads/1/3/2/6/132696155/semuwevovadikekifixi.pdfIn PDF document text
    • http://fudopanazi.22web.org/82639910368.pdfIn PDF document text
    • https://cdn.sqhk.co/defisepeniba/Yjaryge/57699838966.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/iahdhey/94920472468.pdfIn PDF document text
    • https://lidimegofomizut.weebly.com/uploads/1/3/1/3/131380930/4722137.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/2471990.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/kij8pre/find_friends_apple_watch.pdfIn PDF document text
    • http://dudosawiroti.22web.org/cateye_velo_wireless_bicycle_computer_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tunufefenus.rf.gd/nfhslearn_concussion_course_answers.pdfIn PDF document text
    • http://xigakixu.epizy.com/personal_capital_performance_calculation.pdfIn PDF document text
    • http://befojarariwowab.epizy.com/gipajopejawu.pdfIn PDF document text
    • http://bejitepirisobi.epizy.com/simomag.pdfIn PDF document text
    • http://dejifiragilu.epizy.com/cadence_pspice_student_version.pdfIn PDF document text
    • http://beluguliwiwe.epizy.com/clash_of_clans_apk_2018_apkpure.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_off00014241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14241 5052 bytes
SHA-256: 0739881f1b40ab2721f301adc951bcafb07d6ff299a847e666c442512955ce98
font_01_sfnt_off0001537c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1537C 10472 bytes
SHA-256: 272950ded4d473a471e13ee174708c1159b6483563229a408bdc649c61399258

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