Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c6a5a3b99e9352…

MALICIOUS

PDF

67.2 KB Created: 2020-12-29 17:33:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: bdcad862a408cc4d84bc6043c4dee977 SHA-1: cbb2cdeb9f3052ef19289921b5cb3a0edffd95e9 SHA-256: d7c6a5a3b99e93526430c7a1a3de38f918e8628bc775c1aecd2050f8eaf4dac5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/123?utm_term=where+is+310+area+code+out+of PDF link annotation
    • https://cdn.sqhk.co/milevatomog/ghrQJWq/feredixajibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_5fc2f214bef2c.pdfIn PDF document text
    • https://cdn.sqhk.co/salenasova/ygibhjg/tamil_dialogue_sms_ringtone_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zigimovovu/ibbKibw/95616164099.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzezajolu/ARuih0a/runescape_haunted_house.pdfIn PDF document text
    • https://cdn.sqhk.co/nibedogoxov/jhjanEj/maribazikaxoje.pdfIn PDF document text
    • https://cdn.sqhk.co/wavoperusina/m1jijdQ/tejowiruvibimasob.pdfIn PDF document text
    • https://bibafekozoret.weebly.com/uploads/1/3/4/4/134441072/9342481.pdfIn PDF document text
    • https://vebamumu.weebly.com/uploads/1/3/4/7/134730259/96e076434a28f3.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/697de1e8-bfa5-4de0-9ce3-77dbf9ee8f0a/12639035912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20aef233-577e-4bef-b745-53459f774c5d/call_of_duty_black_ops_2_ps3_mod_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d2e6e78-1730-4ae4-90e2-4146a1ce250c/46863180443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e3242a-32e3-4952-8548-099eb7963641/80087778924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/603b3c2e-89c8-4ecc-9f48-be7c09e638dc/ap_calculus_ab_2013_free_response_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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC991 5448 bytes
SHA-256: f27456f1706dbdee33e76cd7801bcac9a91ba02fffd03feac9bb736d5bd14509
font_01_sfnt_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 10624 bytes
SHA-256: b327420de9da8c07f7f186850fa610ef766b6ad434ca20181316e913989f9036

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