Malicious PDF — malware analysis report

Static analysis result for SHA-256 85ed9d7037fe5065…

MALICIOUS

PDF

31.2 KB Created: 2020-05-19 16:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f3bc8b2dd66e488a49712e5c8c6403f SHA-1: 01e1e7588f5bfe1858d3ce66c9cdda53f50c3de0 SHA-256: 85ed9d7037fe506582f0c8e4f54bdebdff4133264fdd4441cc10c86dc498698d
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or distribution mechanism. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to academic subjects and application versions, possibly as lures. The primary function appears to be directing users to a multitude of external PDF resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://humannaturefoundation.com/uploads/1/3/0/5/130550847/130550847.html#mathematical+statistics+with+applications+7th+solutions
    • http://bowlingac.com/uploads/1/3/0/2/130289496/zupusa.pdf
    • http://pkuehne.de/uploads/1/3/0/5/130551089/merixez.pdf
    • http://futuregenerationhomebuyers.com/uploads/1/3/0/5/130543368/tegapebe.pdf
    • http://livecleanlivefierce.com/uploads/1/3/0/6/130603807/xikevuj.pdf
    • http://myplanetearthgallery.com/uploads/1/3/0/3/130323622/7257830.pdf
    • http://bronzebyswacy.com/uploads/1/3/0/7/130775471/ac3137.pdf
    • http://milesoftraining.com/uploads/1/3/1/8/131856622/8731786.pdf
    • http://domindcom.com/uploads/1/3/0/3/130313247/402fc7a6ac7bf4.pdf
    • http://babyandthebeasts.com/uploads/1/3/0/7/130738994/2382234.pdf
    • http://bcboutique.shop/uploads/1/3/0/7/130776309/nozemado-pojopesux-nifux-wedobuli.pdf
    • http://kristamoczygemba.com/uploads/1/3/0/3/130313026/gumidofi_mapiguf_tuniwoximuze_nanopimed.pdf
    • http://counterpunchtv.net/uploads/1/3/0/7/130739539/30f223d6eacb6.pdf
    • http://julyyang.com/uploads/1/3/0/8/130874359/datujilov-vakajux-vugumugipokaju.pdf
    • http://aperioconsulting.org/uploads/1/3/1/6/131606955/sujasobaxuseti-desovekexopavel-piziwepel-wuzukad.pdf
    • http://dillonfaithyoga.com/uploads/1/3/0/5/130551836/gasenijeti_sosavi_zamorujejapi_sadepepofobes.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_off000050b1.bin
bfa294e5781f7d23e886cd6127665159a3e9972387ff7cd5f88b84c03bd79c51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50B1 9484 bytes

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