Malicious PDF — malware analysis report

Static analysis result for SHA-256 db028c36aafa5697…

MALICIOUS

PDF

43.2 KB Created: 2020-04-08 10:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb6142d3db15a881d1d62d9c802680aa SHA-1: 38251bbd025941ee1ff2855a15b33458afe1228a SHA-256: db028c36aafa56976cf562456a649ededf750dec1f2e96d1ba3e724946eb120e
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files on various domains. This behavior is indicative of a link farm or redirection scheme designed to distribute malicious content or lead users to phishing sites. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous SEO-like PDF links is the primary indicator of malicious intent.

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://datanetguatemala.com/uploads/1/3/0/3/130323738/130323738.html#miller+maxstar+150+stl+tig%2Fstick
    • http://thedirtysheetsofficial.com/uploads/1/3/1/4/131454396/26bcc.pdf
    • http://bodyvibesbynique.com/uploads/1/3/1/0/131070212/12a3944924.pdf
    • http://mewantemooseicdayglasgow.com/uploads/1/3/0/7/130738946/4592134.pdf
    • http://houseofpeacehouston.com/uploads/1/3/1/4/131438825/gikafaxajanitug_tanalixuf_woxodusafu_rojonafufezufa.pdf
    • http://rebellecollectivegroup.com/uploads/1/3/0/8/130813779/7e116.pdf
    • http://schhpif.info/uploads/1/3/0/6/130621890/4378869.pdf
    • http://travelsmartwith.me/uploads/1/3/1/0/131070152/bee1010f7a1.pdf
    • http://bellamyboutique.com/uploads/1/3/0/4/130477135/19568344.pdf
    • http://elaurayoga.net/uploads/1/3/0/5/130589277/vigomumar.pdf
    • http://rrinfinitetransportllc.org/uploads/1/3/1/3/131397971/7412d32e0.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a6b.bin
dba9f253019dcfd6999285ec2f9cf6f1e8239c3e607aa85dce27138a597da33a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A6B 8076 bytes
font_01_sfnt_off000089aa.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89AA 16036 bytes

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