Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfd3ea42eff2d57…

MALICIOUS

PDF

81.0 KB Created: 2021-01-26 08:29:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2650bce0fb3bafb6e1b7f81cb986c976 SHA-1: 784be9de6eb285ec415b71dc62d7055ec546b445 SHA-256: 4cfd3ea42eff2d57a4287c5a03a31320cd3da4d52a4a21289c2e3c50a65bf8af
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'maypoin.ru', suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=express+y+in+terms+of+x PDF link annotation
    • https://cdn.sqhk.co/fipimomozuk/iejbVSQ/80541807692.pdfIn PDF document text
    • https://cdn.sqhk.co/sulugedako/7Eieshj/83817843137.pdfIn PDF document text
    • https://cdn.sqhk.co/zobunifi/hf4icja/guide_2k20_among_us_tips_advice.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/iagibK7/rowilunivomimiz.pdfIn PDF document text
    • http://microbladingeyebrowsdallastx.com/my_bowling_3d_gamer1by7.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/XqNoTae/extreme_car_driving_simulator_2018_unlimited_money.pdfIn PDF document text
    • http://pro-komp-master.website/wuvesulebijotetebibabo8uw6a.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/ygyjjhe/draw_line_in_word_document.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/j6b1ibQ/78371554077.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/UgeSwk5/7023191774.pdfIn PDF document text
    • http://chuvashovfamily.ru/3d_car_crash_simulator_game_online998ku.pdfIn PDF document text
    • http://depalowivejal.iblogger.org/dusibuwikugavabukukeju.pdfIn PDF document text
    • https://cdn.sqhk.co/kikutajaz/wgeFhbY/baldi_s_basics_camping_classic_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/95497986072.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/89847992329.pdfIn PDF document text
    • http://tosakiviga.rf.gd/online_chinese_bible_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/agathiyar_film_free.pdfIn PDF document text
    • http://vonupov.epizy.com/81156505138.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/wijakozikinixut.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_off0000fae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE6 4932 bytes
SHA-256: 00caa2948e8ec7c80c26443e88b94a656e76513e947caaba2e2b772bab8d5be6
font_01_sfnt_off00010bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 12308 bytes
SHA-256: 0c8151da6e5c76653e176273fbec979176d556264c3bb63991a01f350462785b

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