Malicious PDF — malware analysis report

Static analysis result for SHA-256 56eae60dfae1402f…

MALICIOUS

PDF

69.2 KB Created: 2021-01-11 18:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ba84415ccc756715ba8bb573ea2423f6 SHA-1: bff3bdeb636770d959b2122658c9cfef8e7cc6b1 SHA-256: 56eae60dfae1402f44d08d461ce986eeeba0a07a13aa83ce16564fb011c55361
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 0.9997

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://trafffe.ru/aws?utm_term=antiterrorism+awareness+level+1+pretest+answers PDF link annotation
    • https://dafufiwe.weebly.com/uploads/1/3/4/3/134368649/768661.pdfIn PDF document text
    • https://tazokadenu.weebly.com/uploads/1/3/2/6/132695553/a146861.pdfIn PDF document text
    • https://siragakepog.weebly.com/uploads/1/3/4/8/134890789/xatabubiguveva.pdfIn PDF document text
    • https://xugilatopuke.weebly.com/uploads/1/3/4/7/134746985/a550cba47.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/domegagowevag/blended_ama_online_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/nobomemefogebamijamaf.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/ridikisulelemolaj.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/27943398356.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/game_hay_cho_android_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/fast_euclidean_distance_transform.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/gawufik.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/kewuzupazuvojak.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_off0000d35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35A 5156 bytes
SHA-256: 03c7180a63b5778c324da4c586ad16d71023ee21f1f4825af7d7e14a95d43443
font_01_sfnt_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 10424 bytes
SHA-256: 0c3032aed5ee7f90dfbe298253a1341bae23af21620cd35868973ed5c4986a00

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