Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4f740397c63ed04…

MALICIOUS

PDF

36.5 KB Created: 2020-05-22 00:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31c9390f07d3b1c52207a8606ce5dbed SHA-1: 73f2321cf226204779e973b0f843dcfe87878670 SHA-256: f4f740397c63ed044480e69edddfa5860a7f97b6a368a448615b5a3efa252cea
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file was flagged as malicious by an ML classifier. It contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO poisoning tactic. The document body contains garbled text but includes the phrase 'Dubai marina map pdf' and references wkhtmltopdf, indicating it's likely a lure document. No scripts were extracted, but the sheer volume of external links is highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://wakefieldmiddleschoolpta.org/uploads/1/3/0/4/130435694/130435694.html#dubai+marina+map+pdf
    • http://blackawakeningchoir.com/uploads/1/3/0/6/130605075/kozuxepu.pdf
    • http://savkb.com/uploads/1/3/0/5/130590153/7591570.pdf
    • http://airambulancethailand.com/uploads/1/3/1/6/131637482/detebezisefer.pdf
    • http://builtonselfsuccess.net/uploads/1/3/0/7/130740183/6650111.pdf
    • http://claymermaid.com/uploads/1/3/1/6/131607229/kitane.pdf
    • http://onlinesignature.org/uploads/1/3/1/0/131070125/5217303.pdf
    • http://teendeveopment.com/uploads/1/3/0/6/130639882/tivujodu.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006349.bin
64483257eb0ac12eb18ab147147f6cd5c9f5c9801bf6673eea0a28e821a1641f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6349 10608 bytes

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