Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee86c01807758ac9…

MALICIOUS

PDF

32.9 KB Created: 2020-06-23 02:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc32fe2a4152c623304d3f8ec56b59a3 SHA-1: b37dfc24a5913cff6653b0054fa0886ab9f7558b SHA-256: ee86c01807758ac907a302257206968f1090ec79f2bb6b2b7aca4e43b8188da2
94 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier. It contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or redirection scheme. The document body, though partially corrupted, also contains several of these URLs. The primary attack pattern appears to be a lure to a network of SEO-optimized PDF content, likely to serve further malicious payloads or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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 http://heart2soulcatering.com/uploads/1/3/2/6/132682541/132682541.html#cours+de+traitement+du+signal+pdf
    • http://thelookingglass1996.net/uploads/1/3/0/2/130271179/dijenogofelu-losumiz-sipefijituz-zegusitexiw.pdf
    • http://mta-sts.kaartenplattegrond.nl/uploads/1/3/1/1/131164046/1149935.pdf
    • http://berwynfirst.com/uploads/1/3/1/3/131380109/poririv.pdf
    • http://lcjoiner.com/uploads/1/3/1/4/131406798/a736bb6e2bd.pdf
    • http://thepercussiongroup.com/uploads/1/3/0/6/130639386/b214254eb.pdf
    • http://gopinathanlab.com/uploads/1/3/0/7/130775987/tebitezizajogi.pdf
    • http://foot-tech.co.uk/uploads/1/3/0/7/130775768/6aa70ee.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004428.bin
69f8957bf2252e66bdea907dfaadbe965b003b809babe46d7ac3fd991d53c614		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4428 5268 bytes
font_01_sfnt_off00005600.bin
37053c236b8f2e2c3b0266587d90f7b781109000874fb102abb76294b04d1051		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5600 10268 bytes

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