Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ecf3962bf740de9…

MALICIOUS

PDF

87.4 KB Created: 2021-03-03 09:13:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8b6bf9f406e3952e2495bfc1e5b1a831 SHA-1: 823e6fc922f29c7db8814259e92b313cce104103 SHA-256: 5ecf3962bf740de960b878e391e2d6bc6bd72fb41211908da901b901fabb2082
156 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 0.9998

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 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.
  • 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://baarspo.ru/123?utm_term=49+o+tamil+full+movie+watch+online PDF link annotation
    • http://milanomoda-italy.website/free_rock_ringtones_for_mobileot2l8.pdfIn PDF document text
    • https://gunimumatepatu.weebly.com/uploads/1/3/5/3/135313318/e7e96.pdfIn PDF document text
    • http://circus.market/lopefepimv81.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/jkDyjck/run_3_online_cool_math_games.pdfIn PDF document text
    • https://gufekibeliwu.weebly.com/uploads/1/3/1/3/131382841/renebajubunag_jakuteworiwaw_baveg.pdfIn PDF document text
    • http://nugidaga.22web.org/holding_deposit_contract_template.pdfIn PDF document text
    • https://dumerozum.weebly.com/uploads/1/3/4/6/134611270/9279849.pdfIn PDF document text
    • https://waniwuwaweduf.weebly.com/uploads/1/3/4/3/134348957/6589215.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/dij0lN8/lenedezidobelirakajosufa.pdfIn PDF document text
    • http://org-fruit.space/4642075273jzor8.pdfIn PDF document text
    • http://astropsychology.website/2277374991idvx1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tupazovux.epizy.com/pizexesaw.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/balance_sheet_analysis_video.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/68202007222.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/jugumonidizi.pdfIn PDF document text
    • https://s3.amazonaws.com/wupuxus/manuscript_handwriting_practice_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/2001_ford_ranger_automatic_transmission_fluid_type.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/chota_bheem_tamil_episode_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/xeresavag.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_off00011a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A76 5148 bytes
SHA-256: 847e5e04368b11a5d359583168cfadd840be74d18c1d3cd9ebc95d498798569f
font_01_sfnt_off00012bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF9 10552 bytes
SHA-256: 10f694c02503cc2a9b9e80bbf3222e9e9591144505f149a474d310f04669b16d

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