Malicious PDF — malware analysis report

Static analysis result for SHA-256 8770bf733c38da75…

MALICIOUS

PDF

70.1 KB Created: 2020-12-20 14:51:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cf2d085ca8e71cf2f53b08264d7fbab9 SHA-1: 3b8ca0888ee71a58e6c059073a3eacdc6428b4c4 SHA-256: 8770bf733c38da75b3543da9c8ab10691d7a9a5b57b7e7b188adcd659d4e670d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to direct users to malicious sites. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of numerous external links, including one to 'trafftec.ru', strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://trafftec.ru/123?utm_term=brooks+transcend+5+review PDF link annotation
    • https://nimizinimaji.weebly.com/uploads/1/3/4/7/134703428/bdcef73184cc.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/e3bc13ee-0e24-4f1b-8f54-77f51350a033/kunidurake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f0f4c6-1988-4d79-b638-1d60767c0c53/true_market_value_of_car.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4dc7ae9fc3622d53b5433/t/5fca1b9755485c3109b95313/1607080859568/nosupukavowazipisufuvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad18fe31-eb1e-43b4-a971-ee1ea4fd8d22/sopalapegodovigal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9cd2fd-db7a-43e7-89e3-28a7f27ad30b/tama_county_assessor_property_search.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/sosubigoxaluj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d33812b-c37d-4c1d-b6a0-abca1dba6a58/jofebegusekulikedabexeriz.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_off0000d453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD453 5288 bytes
SHA-256: 90d77d414e95f144d2d36e967c521a94d0de982c697b5cb69aa05ad70179a3fe
font_01_sfnt_off0000e67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 11028 bytes
SHA-256: 559ddb8a5840809b63d4f5c1e7125ace0e7f82e4ed9ec0a4bce986abe6338ec3