Malicious PDF — malware analysis report

Static analysis result for SHA-256 f257be66781e3121…

MALICIOUS

PDF

34.7 KB Created: 2020-04-03 18:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fc1a7600d543b83875bb0bbcd7265f3c SHA-1: 68a0b9fd537f7c0d3aaf4487e688617cdfc7a7fc SHA-256: f257be66781e3121212f1b23dd55139fe6c76600b589223d375affb2669d182b
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on different domains. The ML classifier also strongly indicated maliciousness. The document body contains a reference to 'www atdhenet.tv' and several URLs, suggesting a coordinated effort to distribute malicious content or engage in SEO poisoning. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://4gen4.org/uploads/1/3/0/6/130621098/130621098.html#www+atdhenet.+tv
    • http://muslimsjobs.com/uploads/1/3/0/9/130969438/poderetexidakap.pdf
    • http://ncfse.com/uploads/1/3/0/5/130539679/2386d2e.pdf
    • http://thesouthernshell.com/uploads/1/3/0/6/130604126/tumofanuvogolama.pdf
    • http://maralynkastel.com/uploads/1/3/0/5/130551564/a5899abeaba.pdf
    • http://swiftskies.com/uploads/1/3/0/7/130775950/tubesepefu.pdf
    • http://dandylilylane.com/uploads/1/3/0/7/130740022/2038007.pdf
    • http://mijn-2e-huis.nl/uploads/1/3/0/6/130604032/c865de.pdf
    • http://anotherworldrecord.com/uploads/1/3/0/9/130969553/wizig.pdf
    • http://coloredtreasures.com/uploads/1/3/1/3/131382243/81a91e3.pdf
    • http://susefarms.com/uploads/1/3/0/9/130969932/tukutir.pdf
    • http://trueeleganceofnapa.com/uploads/1/3/1/3/131384142/sesanavekisogub_zevaf_lodunij.pdf
    • http://hatchettfarms.com/uploads/1/3/0/7/130775263/818235.pdf
    • http://myasia.com.my/uploads/1/3/1/4/131438843/jikilazutajobu.pdf
    • http://walkbikelearn.com/uploads/1/3/0/6/130621025/f7af11d.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_off00005e71.bin
3762153fe6691a35e0b5d112b8cd2d7d4bf253bb7fe0265c8eb69b8a3e1dba49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E71 8128 bytes

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