Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b279ed96b41c3bd…

MALICIOUS

PDF

107.8 KB Created: 2020-11-11 17:56:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c18699e6c0da467b1cc8f906ec1d7917 SHA-1: 2894aac0bbd2a6ff757c3090c5d43b5340f62a1c SHA-256: 7b279ed96b41c3bd0aeddfb1d896e57b4f33f2aaee2902fbf1d21258a3d3435c
156 Risk Score

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 0.9918

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://traffking.ru/aws?utm_term=rudram+chamakam+pdf+english PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369511/normal_5f9565d3f017f.pdfIn PDF document text
    • https://derodaju.weebly.com/uploads/1/3/1/6/131606282/c6f4e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384152/normal_5f8d061d36feb.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/henghuili-files2/autodesk_alias_tutorials_beginner.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/armonicos_esfericos.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/84311147053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73c28936-fca6-41bd-8fac-a3d26685d4d0/common_mistakes_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8efce190-301d-432a-aecb-bf2a9765a604/nazopasiduxorizekux.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/dqm_joker_synthesis_guide.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000173c3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x173C3 26484 bytes
SHA-256: 3dad71afa69df2c4356c2afb2021f64cb7ae1911f14a51ff8a63cf798d53d344
font_00_sfnt_off00013d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0D 5640 bytes
SHA-256: 48c49fb7dbb878575a327478df363ca755e1256ca1ac4f6f019ae8366d3492b2
font_01_sfnt_off0001501b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501B 10576 bytes
SHA-256: 2a5ef2fd431e36824847250f5ed506168b33dd5c7b7cf73659092d883d836420