Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf384b2f41f31d6f…

MALICIOUS

PDF

34.1 KB Created: 2020-03-28 09:15:47 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 32e973f1c490ea85b99576fdd6f39458 SHA-1: 1de68bae3bea7b9e1a77906e9a8fe559f14b7781 SHA-256: bf384b2f41f31d6f33a7f37722618388d2ddee355e3bdc7a5d739047ecb321a3
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm for SEO manipulation or to host malicious content. The primary heuristic firing indicates a mass external PDF link farm. The document body, though partially corrupted, contains a URL that appears to be a lure for technical information. No scripts were extracted from this sample.

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://youngandawake.nl/uploads/1/3/0/5/130551536/130551536.html#linksys+pap2+default+username+and+password
    • http://www.mayetpinspections.com/uploads/1/3/0/5/130547150/mubitoxekovozo.pdf
    • http://www.honorequip.net/uploads/1/3/0/2/130272414/62c56b2eecd6a6.pdf
    • http://ultravioletperceptionart.com/uploads/1/3/0/6/130604349/8648434.pdf
    • http://35ewc.com/uploads/1/3/0/3/130323409/3580117.pdf
    • http://joshlane.net/uploads/1/3/0/6/130639166/8195a9154365b2.pdf
    • http://serbaballet.com/uploads/1/3/0/7/130738631/rubujugizowufokimo.pdf
    • http://allnaturalproteindrinks.com/uploads/1/3/0/8/130874567/zagozotu.pdf
    • http://groenemarktstrijen.nl/uploads/1/3/0/4/130489417/fusewuradivovuxogiv.pdf
    • http://btimsp.com/uploads/1/3/0/2/130271145/bugeripaxefobesap.pdf
    • http://scripttoscreenplay.com/uploads/1/3/0/5/130539279/9975745.pdf
    • http://wearebones.com/uploads/1/3/0/6/130621342/xafibuzet_tefisitobib_ditogukazatuwab_gegibesosala.pdf
    • http://eracook-demo1.com/uploads/1/3/0/7/130776619/85060.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_off00005d53.bin
cde14b9c50a9e562e7880262d99ddd346c81a350b24ae6010736cab59cdc61e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D53 7740 bytes

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