Malicious PDF — malware analysis report

Static analysis result for SHA-256 181a7e720c23312a…

MALICIOUS

PDF

71.5 KB Created: 2020-11-29 10:21:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6d4d6ec1f41daace0c1eccc6723f9f69 SHA-1: 1a124c1ff24cff4c5d7770e042fc6eb59604d700 SHA-256: 181a7e720c23312a1c5bad93c62f1fbd9758a38302ab0b8b202c7c9f7312675b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to 'trafftec.ru', suggesting a potential phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature, classifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure indicates a malicious intent to redirect users to external content.

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
  • 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/aws?utm_term=android+root+detection+code PDF link annotation
    • https://vigakamodibit.weebly.com/uploads/1/3/4/7/134770941/fajoladuxelugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5fba8e364e214.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/sabobenuwe/53703304068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c35a7d43-5800-4430-8c5f-520ccee6842b/13402992997.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/josodubimeruxutalurunesot.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/17368209117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70268267-1dfc-4424-8c02-8e858ec23b12/wamozadumeledotazop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/971fa6c9-0104-4333-9607-1fcd93d16b27/33403375342.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f0647db-8a99-40d3-935f-04c5f81b6b01/fender_musicmaster_bass_serial_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd1ce01b-cfdc-4670-930d-597dd0bf6edb/74953129997.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/nokaxazepudavunized.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e0e08c-72d9-44f0-bdd3-d48732cbaa82/dewimeruvakevitinab.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_off0000dbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC1 4500 bytes
SHA-256: 7d3075017478b6f1b343230e62a91c3bea155b1028fd0c3d63aa8ee2da70ff28
font_01_sfnt_off0000eb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB20 11152 bytes
SHA-256: 438aab0e9cd62ddf97cd877d70faf2905e04dc790dfdb28a789123b1f57a751d

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