Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96954c335be32be…

MALICIOUS

PDF

53.4 KB Created: 2020-06-05 20:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6cba61f439ef2601c001ae262f37dae SHA-1: 00c4ff09b94f974616acf532156151922817016b SHA-256: f96954c335be32be0276775e739d0a6078e36d4d1212c6fc65f33e51abd49753
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant portion pointing to domains that appear to be part of a link farm. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior, indicating an attempt to manipulate search engine results or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine the exact lure.

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://wcd-ont9trwo.mgh-r.ch/uploads/1/3/0/2/130289571/130289571.html#abdurrahman+%25C3%25B6n%25C3%25BCl+full+alb%25C3%25BCm+indir
    • http://triadinfluence.com/uploads/1/3/0/2/130288465/dedobulig.pdf
    • http://devotedhelpinghands.com/uploads/1/3/0/4/130488098/zizipivum-lojaxisefugul-bedeledazokuxas.pdf
    • http://strengthsgrid.com/uploads/1/3/1/1/131164310/xopijukusesiwuvax.pdf
    • http://mail.blushwinebar.com/uploads/1/3/1/4/131453998/2353586.pdf
    • http://myrocketflow.com/uploads/1/3/0/4/130489530/5321286.pdf
    • http://wcd-ont9trwo.mgh-r.ch/uploads/1/3/0/2/130289571/terms.html
    • http://wcd-ont9trwo.mgh-r.ch/uploads/1/3/0/2/130289571/dmca.html
    • http://wcd-ont9trwo.mgh-r.ch/uploads/1/3/0/2/130289571/policy.html
    • https://pikivebiziw.files.wordpress.com/2020/06/gutexewakulojenedo.pdf
    • https://rusevaleno.files.wordpress.com/2020/06/79279169608.pdf
    • https://nisawutuvava.files.wordpress.com/2020/06/64640097606.pdf
    • https://rixepigato.files.wordpress.com/2020/06/93872358927.pdf
    • https://jiwijeki.files.wordpress.com/2020/06/pesowubonuribapikeneta.pdf
    • https://diloxer.files.wordpress.com/2020/06/74737847280.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_off0000802d.bin
9fece832c3dba1fac8a4c82c30987a0df1ac035e7b10d884a85c8bcded04290d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x802D 17096 bytes
font_01_sfnt_off0000b221.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB221 16204 bytes

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