Malicious PDF — malware analysis report

Static analysis result for SHA-256 f543a4a0779fe263…

MALICIOUS

PDF

32.0 KB Created: 2020-06-22 22:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f731ddc00aa747228a8aedb431328eb SHA-1: 77b05e055297953847df27a2c808e178dbd22788 SHA-256: f543a4a0779fe263824af89cb6765f70862cbbe656cf228c8b31d94bf11a902a
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 in SEO poisoning attacks to drive traffic to malicious sites. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample, but the embedded URLs suggest a delivery mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://tedvictor.com/uploads/1/3/0/4/130478709/130478709.html#cours+vhdl+pdf
    • http://arpeggionyc.com/uploads/1/3/1/6/131637755/zopenow.pdf
    • http://ministeringwithmegan.com/uploads/1/3/0/6/130622012/9830496.pdf
    • http://kavalashes.com/uploads/1/3/1/3/131380126/6384326.pdf
    • http://mypecans.com/uploads/1/3/0/3/130313081/rulolusevobano-geveranoduxobuw-puxedetenutinik.pdf
    • http://801grandleaseofferings.com/uploads/1/3/1/4/131453542/texofimogo-giput-xekelokox-xedopitefo.pdf
    • http://carolinawellness.center/uploads/1/3/0/9/130969826/1feb2f78598.pdf
    • http://archrealtyhomes.com/uploads/1/3/0/5/130588380/jefapibulub.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000427b.bin
904219ecfef4527739926879866c1687ddcd3957d8e8a564ec59afaeb772aa4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x427B 4532 bytes
font_01_sfnt_off000051fa.bin
b0892cf932d5761de10cabe04cfb754a73eb07fa2f2a062760b4a74010417c56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51FA 10176 bytes

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