Malicious PDF — malware analysis report

Static analysis result for SHA-256 73090ac0faf3387c…

MALICIOUS

PDF

70.5 KB Created: 2020-12-29 18:41:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7267b3e5464178acbf57866991f7f221 SHA-1: ba94c541db5d107aab63660e88013e892e70dbf3 SHA-256: 73090ac0faf3387c2359c93115cc6d6e4ce04f9514f4b041a1e5d2d33f80b8b2
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'free casino games slot machines', aligning with the heuristic findings of a link farm. The presence of ClamAV and ML detections further supports its malicious nature, likely serving as a lure for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffmen.ru/strik?utm_term=free+casino+games+slot+machines In PDF document text
    • https://cdn-cms.f-static.net/uploads/4502511/normal_5fc31c95081e3.pdfIn PDF document text
    • https://pabenegoje.weebly.com/uploads/1/3/4/3/134348732/591128.pdfIn PDF document text
    • https://cdn.sqhk.co/silakozafi/jbajc04/contact_lenses_prices_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/urihdFp/gajemoji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409236/normal_5fbde8b992a04.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/sugaguxagu/kapogusamikisuvup.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/capitulo_7a_workbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aeb3ffa-ae58-4c79-8a3a-bd31813bb9b3/game_key_revealer_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/marriage_wishes_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4898eb03-a662-4d35-86af-f98301ec5bed/25017176098.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/manual_for_ge_spectra_oven_self_cleaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/337c67ef-0f97-4ad0-9f43-ef7216545989/fupupalesoza.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_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 5168 bytes
SHA-256: f9917984eda463fa64eff5efac37f817a331a9433ad5611c26161d4f77fdf688
font_01_sfnt_off0000ea79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA79 10276 bytes
SHA-256: 4b842aa84d1898e9f90efbf593e7360225f16b293e7db858411641109a0ee39b

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