Malicious PDF — malware analysis report

Static analysis result for SHA-256 21515b7faa82d110…

MALICIOUS

PDF

39.0 KB Created: 2020-03-29 11:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 100a2ea231274cd41e87667c508cba5e SHA-1: 03fa9ba7c887f2f9ced2355fdb9d6578812836e7 SHA-256: 21515b7faa82d110c51c943e9fa3220c0f4a93f26f33a5e4b2ce3837d3341bb3
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, a technique often used for SEO spam or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The document body itself is heavily obfuscated and appears to contain embedded URLs, reinforcing the link farm behavior. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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://allergy.mediutopia.com/uploads/1/3/0/3/130312934/130312934.html#bsa+first+aid+merit+badge+powerpoint
    • http://despreslandscaping.com/uploads/1/3/0/7/130740444/ca613991e8.pdf
    • http://jeffreylacyford.net/uploads/1/3/0/4/130476908/godobaxazofulosasa.pdf
    • http://msedwardsmathclass.com/uploads/1/3/0/2/130287881/2718584.pdf
    • http://pelada.de/uploads/1/3/0/6/130604161/kigolavaxona_zafek.pdf
    • http://dummieclothing.net/uploads/1/3/0/4/130483512/6261624.pdf
    • http://pbalternatives.com/uploads/1/3/0/9/130969839/c7fe5b10b8e3c.pdf
    • http://yerkesoutreach.com/uploads/1/3/0/7/130739782/lumibosagizodaxitabi.pdf
    • http://lescondosla.com/uploads/1/3/0/6/130639071/kuzupim.pdf
    • http://ebonyhairexpressions.com/uploads/1/3/0/7/130776413/tipitez.pdf
    • http://prideonthepatio.com/uploads/1/3/0/4/130488445/vemijaxarobuxagezeno.pdf
    • http://juniorvolunteerleague.org/uploads/1/3/0/6/130604973/gobejesabeleb.pdf
    • http://lifefanatic.net/uploads/1/3/0/6/130604666/dacc2f.pdf
    • http://hypnomieux-etre.com/uploads/1/3/0/6/130620632/wejogadisix_pixolovuviw_ladapuvepagiwak.pdf
    • http://zahkingbeats.com/uploads/1/3/0/7/130738769/rosawedive.pdf
    • http://goldsborosinglesclub.com/uploads/1/3/0/6/130605212/wufosovixiv.pdf
    • http://cbcatcher.com/uploads/1/3/0/7/130739793/5339767.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_off00006e7f.bin
bff4eae6012b00bcdc01a75c1dc82d3797101806664c0bbc17cc840617a964e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7F 8312 bytes

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