Malicious PDF — malware analysis report

Static analysis result for SHA-256 de58e8631a6b2b4c…

MALICIOUS

PDF

74.0 KB Created: 2020-04-21 23:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a415ad9c4a45093a11d4b12eef713e50 SHA-1: 9891031da9e19c026bcd82b68b152e7f22cc69d3 SHA-256: de58e8631a6b2b4c67eb088828d510946edbf29627f4e2b5947fc91f009bf935
92 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many with numeric or book-related slugs, indicative of a link farm or SEO abuse tactic. The ML classifier also flagged this PDF as malicious. The primary intent appears to be directing users to potentially malicious websites hosted on domains like 'saltcitysulcata.com' and 'sewitallonline.com'. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9061

Heuristics 3

  • 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
  • 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://saltcitysulcata.com/uploads/1/3/0/4/130488429/130488429.html#free++bhagavad+gita+in+english+pdf
    • http://sewitallonline.com/uploads/1/3/0/4/130435774/ginewizuge-lifuga-tupobuwux.pdf
    • http://she-racreations.com/uploads/1/3/0/5/130540795/gubidimamib_dajeno_lavidejesi_misigubisakoro.pdf
    • http://human-entities.com/uploads/1/3/0/2/130272395/jawor.pdf
    • http://doublemranchminiatures.com/uploads/1/3/0/2/130287281/4807027.pdf
    • http://thepaymebackcard.com/uploads/1/3/0/6/130604427/13903.pdf
    • http://braveheartconstructionltd.net/uploads/1/3/0/6/130605173/kufev-sekudatu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a319.bin
7733789191d81f487364d5d3eba8c344adf7c357446af2779b1944f31c4063ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA319 8536 bytes
font_01_sfnt_off0000c3e4.bin
91cf9cd4efac8f69dcdf587659185da8236567bce3e9e4f6a5ecd944f50fae4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E4 1428 bytes
font_02_sfnt_off0000cbb2.bin
bb65e153df78154bfd14470754e87ba03df7715f8d52849d071c5334056f3476		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB2 16096 bytes
font_03_sfnt_off0000e07a.bin
7bb4fba4ef43c4ad680c6dfa4bf3e4f1c69c5fce4dc376feb57700f5ffacbb83		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 20328 bytes

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