Malicious PDF — malware analysis report

Static analysis result for SHA-256 92138592f8f3071e…

MALICIOUS

PDF

32.3 KB Created: 2020-04-02 07:42:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2c84bd686772ef5a71719375a957fff5 SHA-1: 178a4e362120be85c111081f6830bdedb852041b SHA-256: 92138592f8f3071e89f06c772606eb99d0296d6949c5f2fbc114380d9cf9d13d
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, a common tactic for SEO poisoning and driving traffic to malicious sites. The document body, though heavily obfuscated, contains a URL that appears to be a lure for technical information. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm.

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://thetowermen.org/uploads/1/3/0/4/130476859/130476859.html#sony+vaio+svf152a29m+bios+enter
    • http://walkinginlife.com/uploads/1/3/0/5/130540106/newidix.pdf
    • http://shopbienfemme.com/uploads/1/3/0/7/130776319/vezino_givoxatugog_raxetewu_ludaver.pdf
    • http://mayasanti.com/uploads/1/3/1/3/131382447/4653575aaaf55.pdf
    • http://medinamathlessons.com/uploads/1/3/0/2/130273581/jogimuwaremesumuz.pdf
    • http://hawgridin.com/uploads/1/3/0/5/130544067/gopik_xerodejebenis.pdf
    • http://lizzyshay.com/uploads/1/3/0/4/130476481/rojakelixut-dajalagemupo.pdf
    • http://nextripchile.com/uploads/1/3/0/7/130775649/5168772.pdf
    • http://oddsandsudsashburton.net/uploads/1/3/0/3/130323281/fakegobejeragi.pdf
    • http://goodie2019.com/uploads/1/3/1/4/131407278/9c81f287939c4.pdf
    • http://moralehemp.com/uploads/1/3/0/4/130435685/9644612.pdf
    • http://dandldistributing.com/uploads/1/3/0/6/130605349/64912426.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_off000054b0.bin
a6a2d0a515495fd1b99984baf257d22b52428e1b0aeffebb5e66654b0c6849f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54B0 8808 bytes

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