Malicious PDF — malware analysis report

Static analysis result for SHA-256 debfdda9b1bb145b…

MALICIOUS

PDF

37.8 KB Created: 2020-03-25 14:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cec8377b9c8647a47b7a979591b5494e SHA-1: 950476fdaf2ae31087973c5aee979aefee15ac42 SHA-256: debfdda9b1bb145b3368ae1036b6b49af58e520a93550b1814ba9cd6a71f3cbc
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to a network of websites, likely for SEO spam or to host further malicious content.

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://sacredgroove.net/uploads/1/3/0/3/130323159/130323159.html#dorothy+johnson+biografia+pdf
    • http://towing54.com/uploads/1/3/0/5/130588830/1530005.pdf
    • http://www.undercardstore.com/uploads/1/3/0/6/130620424/1313517.pdf
    • http://thenestingspot.org/uploads/1/3/0/7/130775688/9ec2fc7a33.pdf
    • http://jalksjdlfkjslkjf01.space/uploads/1/3/0/7/130740128/8975738.pdf
    • http://couleeregionfitness.com/uploads/1/3/0/2/130289479/4c6733.pdf
    • http://www.frozesweets.com/uploads/1/3/0/2/130289502/fexup.pdf
    • http://shanghaiveggies.com/uploads/1/3/0/7/130738679/xoroz.pdf
    • http://idolashes.blog/uploads/1/3/0/2/130272347/baba4632e5df70.pdf
    • http://ironwillhiking.com/uploads/1/3/0/6/130620365/93cfe.pdf
    • http://chirocda.com/uploads/1/3/0/7/130775370/89e09bcde8ab9c6.pdf
    • http://alteredsky.net/uploads/1/3/0/6/130639275/8728257.pdf
    • http://www.akinspectionsweeblycom.com/uploads/1/3/0/9/130969082/bab64e5e2a15.pdf
    • http://reicoinvestment.com/uploads/1/3/0/6/130605387/jajipujawobamelan.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_off00006abe.bin
1788fd79a2e0ed1d61bb8aeb8ad95bde356e2b1e33b2f123652d48086bfd43ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABE 8148 bytes

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