Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbec6c5de5bfe84c…

MALICIOUS

PDF

50.8 KB Created: 2020-03-21 19:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d14e7d2f77ac26971b3837be0b4388cb SHA-1: d45fd619d684e9ea9f2431dbb7a4b96a47ec2188 SHA-256: dbec6c5de5bfe84c71381ac411687287c76d04fc6da24ad644786d0f3c0ce125
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 to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains a URL that points to one of these external PDFs. This suggests a tactic to manipulate search engine results or to distribute a large volume of content, potentially malicious, through a link farm.

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://annotalegal.com/uploads/1/3/0/6/130604078/130604078.html#formula+de+area+de+un+cuadrado+ejemplos
    • http://mryanki.com/uploads/1/3/0/3/130379231/neriropogokimov.pdf
    • http://lmcommunityfoundation.org/uploads/1/3/0/5/130539642/fapelu.pdf
    • http://thepcsonline.com/uploads/1/3/0/2/130274088/0f72b269.pdf
    • http://www.cirkas.info/uploads/1/3/0/3/130313698/5140069.pdf
    • http://mka-remix.com/uploads/1/3/0/2/130271046/06f8649.pdf
    • http://www.solstrandkonferansen.com/uploads/1/3/0/5/130590257/pomorugala_nogofizexudeliz.pdf
    • http://humptybumptybubble.com/uploads/1/3/0/7/130740221/tedusow.pdf
    • http://www.purplebutterflykids.shop/uploads/1/3/0/7/130738850/vigivelek.pdf
    • http://heartellectual.com/uploads/1/3/0/7/130738712/896cb9d5c6a55.pdf
    • http://darlingparrots.com/uploads/1/3/0/6/130620356/sizejugipo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d40.bin
ead39de356059158f48a8758abdddbbdbe4564527e16cef6963c0b1b24509af6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D40 11380 bytes
font_01_sfnt_off000092fc.bin
e6247172e152b2beb611611cd8c41fc3c3fbe19307a0d04255cee9b1fa8ccfcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92FC 6144 bytes
font_02_sfnt_off0000a6d8.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6D8 16036 bytes

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