Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf118329e42b5ab2…

MALICIOUS

PDF

31.2 KB Created: 2020-04-07 18:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e7605c4111423be1efef7709f5e58f4e SHA-1: 982ca839355e0f5497f429478e7d316ac9de65ff SHA-256: bf118329e42b5ab2ce9703da7b7fd3f928fc1441ef9dc94fc11044ce6bced059
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The document body, though partially corrupted, contains text related to a song download, which is likely a lure to direct the user to one of the malicious URLs. The ML classifier strongly indicated maliciousness, and the PDF_URI and PDF_SEO_LINK_FARM heuristics confirm the presence of suspicious external links.

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://mhtdbtest4739.com/uploads/1/3/0/7/130739117/130739117.html#tere+bina+jeena+saza+mp3+song+downlo
    • http://milegion-legacyrun.org/uploads/1/3/0/6/130620305/be13b.pdf
    • http://jdotech.net/uploads/1/3/0/8/130813827/5931936.pdf
    • http://nutritionalbiochemistryresearchgroup.org/uploads/1/3/1/1/131163695/bb63a713eff55e6.pdf
    • http://lapenderiedezoro.com/uploads/1/3/0/6/130605078/f4aa8ea8b26a01.pdf
    • http://israelweddingband.com/uploads/1/3/0/5/130543028/609342.pdf
    • http://webdisk.maderakubo.com/uploads/1/3/1/4/131406676/fesexuxokid.pdf
    • http://igetweddings.com/uploads/1/3/0/2/130288626/e3bdab98af5eea.pdf
    • http://www.appointments.macksoftware.com/uploads/1/3/1/1/131164352/mijolun.pdf
    • http://hometravel.info/uploads/1/3/0/6/130620159/fagifoxegizowavude.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_off0000530a.bin
677a1f00e6f86d57bac9abb8191f3945d15c6c0455bea4afc7b83ab1320ebaa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x530A 7256 bytes

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