Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba566b7b05761757…

MALICIOUS

PDF

33.3 KB Created: 2020-05-14 04:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e0b41552bebe76194b45fda39d6807b8 SHA-1: 7973bff88024edcf8d68614c63849a794760fc22 SHA-256: ba566b7b05761757bedd78aa285dea8f2f352aa0c1fad0d23a56d30d965f9e25
96 Risk Score

Malware Insights

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

The PDF document employs a common SEO poisoning tactic, embedding a large number of links to external PDF files under the guise of offering free Adobe Reader. The ML classifier strongly indicated maliciousness. The primary lure appears to be the 'adobe reader 9 free for laptop' text, directing users to a link farm hosted on mauubezpieczenia.pl and trbpictures.com, among others. No scripts were extracted, but the extensive link farm suggests a drive-by download or redirection to malicious content.

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://mauubezpieczenia.pl/uploads/1/3/1/4/131438356/131438356.html#adobe+reader+9+free++for+laptop
    • http://trbpictures.com/uploads/1/3/0/6/130640032/fodagikejudebajegoga.pdf
    • http://brandikandilocs.com/uploads/1/3/1/3/131382607/xetudog-tefades-rovuvisadetuvuz-nonewipib.pdf
    • http://reneesdreammakers.com/uploads/1/3/0/6/130604993/97dae.pdf
    • http://youarewrongiamright.com/uploads/1/3/0/7/130776489/mozonepekeloj.pdf
    • http://stogether.net/uploads/1/3/0/4/130483565/e8a9ad96e48f4.pdf
    • http://thebrandonkeiffershow.net/uploads/1/3/0/7/130775282/8283958.pdf
    • http://speechsounds.xyz/uploads/1/3/1/6/131637668/bc362c7.pdf
    • http://restaurant-lindenberg.ch/uploads/1/3/0/5/130588621/3d87947d7284b8b.pdf
    • http://tijdvoormassage.nl/uploads/1/3/0/6/130621608/7aafb.pdf
    • http://brendonsingh.com/uploads/1/3/1/3/131384289/3504eb5b3.pdf
    • http://josephmcinerney.com/uploads/1/3/0/5/130589275/nisaxitali.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_off00005698.bin
86ff3fd0ac525f813d5550875213781a1badb2643d3f727b37b4f82f276ef7b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5698 10472 bytes

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