Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c6cf11c6efa31b…

MALICIOUS

PDF

37.0 KB Created: 2020-06-21 23:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ae8fd2591e0881649cf3a0087d9cee2 SHA-1: 1f66abfdd38f091742e2798540769f5317815fdf SHA-256: f6c6cf11c6efa31b38150c9e70b5592ef4263ed4c2692f9145ed87edc0605736
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though heavily obfuscated, also contains several of these URLs. This suggests a link farm or SEO manipulation tactic, potentially leading to phishing or malware distribution. The ML classifier also strongly indicated maliciousness.

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://eestest1.eesforjobs.com/uploads/1/3/0/6/130621068/130621068.html#sorting+of+materials+into+groups+worksheets
    • http://teambuller.com.au/uploads/1/3/0/5/130543761/6ecf5.pdf
    • http://dresscodellr.com/uploads/1/3/0/5/130551387/tilepeziv.pdf
    • http://oumnaturelle.net/uploads/1/3/0/8/130874518/satol.pdf
    • http://angrybullproductions.com/uploads/1/3/1/3/131378993/504ed87558c.pdf
    • http://myetinfo.com/uploads/1/3/0/7/130739026/1625169.pdf
    • http://74-123-77-232.mgwnet.com/uploads/1/3/0/3/130323315/dozulere_bujuliputibo_pimanoju_beliguvore.pdf
    • http://yellow-confers.com/uploads/1/3/0/7/130740492/9705131.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_off00004f6e.bin
50d2e7ddecb40c13307bbb69ed26bcba9e75f9cc4851357c9b144d8fc178c0ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F6E 5456 bytes
font_01_sfnt_off000061d7.bin
106a5559bc2a7b8d46878049314173d5d7245969dd7572f0374595890c082d55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D7 10732 bytes

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