Malicious PDF — malware analysis report

Static analysis result for SHA-256 574c3385abe44ccc…

MALICIOUS

PDF

36.6 KB Created: 2020-04-09 01:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0d5bc4178cc00404c91c45180ebdec2b SHA-1: 84a3d9b519ff5242469af08fcf4776d0ad5fa09e SHA-256: 574c3385abe44ccc9c9cbe8998955e9ce6730017781021184884a034c53097bf
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, many of which point to other PDFs hosted on similar domains, indicating a link farm or SEO poisoning tactic. The document body, though partially corrupted, contains a URL that likely serves as a lure to download further malicious content. The ML classifier strongly supports the malicious verdict.

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://muapic.com/uploads/1/3/0/4/130493816/130493816.html#do+real+diamonds+break
    • http://feelinglikeaman.com/uploads/1/3/1/1/131164472/9456f4d3f1d21.pdf
    • http://borlaugglobalimpact.net/uploads/1/3/0/2/130272352/5266133.pdf
    • http://convenientfeels.com/uploads/1/3/0/8/130874524/c9c8317d6134a.pdf
    • http://mousingarounddisney.com/uploads/1/3/0/6/130604109/kafisudesoposipofuzo.pdf
    • http://suprbit.com/uploads/1/3/0/6/130639532/6537043.pdf
    • http://zoe4kids.com/uploads/1/3/0/8/130873946/994460e7.pdf
    • http://adelasalas.com/uploads/1/3/1/1/131163687/masaguwunebi.pdf
    • http://ratswithwings.net/uploads/1/3/0/5/130551402/2626272.pdf
    • http://kramersbreadandbutter.com/uploads/1/3/1/1/131163590/2b256c8.pdf
    • http://rifemachine.info/uploads/1/3/1/3/131383242/buzuluxozexole_najadevepug_tibetabavebexuj.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_off0000662c.bin
96d6e27cc7e0834e498609e5ec16f216c21b116f58418e641161d79ce7a3be3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662C 8252 bytes

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