Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2c20af23ab7818…

MALICIOUS

PDF

68.2 KB Created: 2020-11-18 06:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 454931237707891fe8f5dec5ed4c9a55 SHA-1: 1d54f61c17ef394e63bd592928883c03a720b5eb SHA-256: af2c20af23ab7818a870bc07c82e5e67a486b27cb30a4a8702998495b7551b58
274 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of an advance-fee scam, specifically a fake lottery win, as indicated by the document body and heuristic firings. It contains a mass of external links, with one identified as a known malicious redirector. The presence of multiple PDF links suggests an attempt to create a link farm or distribute further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ggtraff.ru/123?utm_term=princess+margart+lottery In PDF document text
    • https://tifobavojosimiz.weebly.com/uploads/1/3/4/5/134505066/2309147.pdfIn PDF document text
    • https://wikazire.weebly.com/uploads/1/3/0/9/130968935/184932.pdfIn PDF document text
    • https://duxevuwelinabim.weebly.com/uploads/1/3/4/3/134353564/ca47cbb3d8.pdfIn PDF document text
    • https://gisetokitalakak.weebly.com/uploads/1/3/4/6/134600310/bifamugud-garijisujibefep-luzudopew-bogafobed.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/0eedab24-379d-4209-ad0d-82f94ebd0771/voxubunetatisukowinad.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/17304511696.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/building_blocks_game_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c2f5a0-d619-4acf-99d1-24c27cd92fb1/us_indicia_status.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/985989a9-0e87-4923-ab2a-0e631ba4b4bd/jurisprudence_exam_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/zosijazezogax.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/dna_sequence_to_rna_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/bin_sachivalay_clerk_paper_2017_download.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/kodi_movie_apps_2018.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB728 5224 bytes
SHA-256: fa0ca8981453d54a769c25f054c6147ef438baa7e8345889eabe41b88357052d
font_01_sfnt_off0000c8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DB 11280 bytes
SHA-256: 94768e83cda055f84703b69a7338294691d8912a3a2b4558c7dc9222af5f3bbd
font_02_sfnt_off0000eeef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEF 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

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