Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2c441f3f50e22f…

MALICIOUS

PDF

44.6 KB Created: 2020-03-09 09:30:16 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3f1744602af05d596bb6445973afa63a SHA-1: e89d99c31362e82aeb07122a057bb5fdd35d5208 SHA-256: 6e2c441f3f50e22f2eb0e1f985df8d8705b6c06e3c7e649b52c433d8eb286686
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded external links, many of which point to similarly structured URLs. This behavior is indicative of a link farm or a mechanism to distribute malicious content across numerous domains. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is designed to redirect users to potentially harmful sites.

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://index92.pleasingfood.com/uploads/1/3/0/9/130969032/130969032.html#mix+design+ratio+of+concrete+pdf
    • http://6u2ct6.bdgct.com/uploads/1/3/0/2/130289334/kukib.pdf
    • http://greaterpeoriaworks.com/uploads/1/3/0/6/130621490/7329455.pdf
    • http://ashleydunn.blog/uploads/1/3/0/6/130639729/7803940.pdf
    • http://richmondtirerepair.com/uploads/1/3/0/3/130323255/dukujewipor.pdf
    • http://amandacake.com/uploads/1/3/0/6/130639426/87f351da7.pdf
    • http://www.ethosacademy.org/uploads/1/3/0/7/130775143/1268901.pdf
    • http://ebbandflood.net/uploads/1/3/0/6/130604210/47377.pdf
    • http://www.harrietbalcombe.com/uploads/1/3/0/5/130546486/nojal.pdf
    • http://fuzzymath.org/uploads/1/3/0/5/130550955/2466002f9bd.pdf
    • http://jakegablonski.com/uploads/1/3/0/6/130604273/vuneronapazuzilos.pdf
    • http://aasiyahs.com/uploads/1/3/0/6/130604524/cc168.pdf
    • http://rockingwithpurpose.com/uploads/1/3/0/7/130739198/1036026.pdf
    • http://www.proyectochispa.org/uploads/1/3/0/6/130621749/potesaxusuga_zulajutax.pdf
    • http://jannekedegroot.com/uploads/1/3/0/6/130621985/nikovitowemajazon.pdf
    • http://myagencyview.com/uploads/1/3/0/4/130483459/4805082.pdf
    • http://lightcodesmusic.com/uploads/1/3/0/4/130436271/97c5dc361a.pdf
    • http://thelittlesleepyhead.com/uploads/1/3/0/2/130272388/lezozibunolof.pdf
    • http://northumberlandday.net/uploads/1/3/0/7/130738546/wozimipumadogenomaw.pdf
    • http://word-image.org/uploads/1/3/0/5/130590569/6be17745f6df4.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_off00007982.bin
db6bc5c788d01637e7b42583c822fbbe43a09ad507af23482dd9ed07ccfa8689		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7982 9160 bytes
font_01_sfnt_off00009c1d.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C1D 1708 bytes

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