Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a36bf7cf0b86b0e…

MALICIOUS

PDF

55.7 KB Created: 2020-04-03 16:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 347fbc1a5c06dde79de2debce8ad8dd4 SHA-1: aa295ddc46b8623fee5e64b5bab9cc1aa4acb12b SHA-256: 3a36bf7cf0b86b0eef8c859005909e1273a2f273e28519496ed40376ff23ce05
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

This PDF document employs a link farm technique, embedding numerous external links to other PDF files. The document body contains a deceptive lure related to song downloads, aiming to trick users into clicking these links. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm, suggesting the document is designed to distribute further malicious content.

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://varnamala.net/uploads/1/3/1/0/131070398/131070398.html#papa+kehte+hain+bada+naam+karega+song+download+mp3
    • http://solebait.com/uploads/1/3/0/3/130323285/64b1fac019c8934.pdf
    • http://lab215spitta.net/uploads/1/3/1/4/131414297/velusaxagus.pdf
    • http://christinewallphoto.com/uploads/1/3/0/4/130477083/8008687.pdf
    • http://indigenous.agency/uploads/1/3/0/3/130313090/2144235.pdf
    • http://mymontagne.com/uploads/1/3/0/7/130776351/kererupemorotoj-fakomiditeg.pdf
    • http://oceanus-rov.com/uploads/1/3/0/5/130589239/bogafojad-pujikapisojono-tuwamep-berukilaruzem.pdf
    • http://fiestasyeventoscristal.com/uploads/1/3/0/6/130639348/roposerimilinuxatuzi.pdf
    • http://lovefail.net/uploads/1/3/1/3/131384300/52f4784.pdf
    • http://mediterranemtbchallenge.com/uploads/1/3/0/3/130379380/7798011.pdf
    • http://elysianwhitetails.net/uploads/1/3/0/7/130775071/tegopiruwavenadizi.pdf
    • http://aksvinfotech.com/uploads/1/3/1/4/131437864/welepab.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_off0000823a.bin
c31cbd57bbe23a7f373a55b68076c773568956d8498864cd61c3512a7b55dfa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x823A 8652 bytes
font_01_sfnt_off0000a34f.bin
cbd0148da7bbbff23ec47194401c3f1c03d79ba7b8135dbef378e0828e3acd51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA34F 1844 bytes
font_02_sfnt_off0000ac27.bin
038b79146cb1e2ff0758c0bbe7bc1ba9cc0803b8d286ff93a1418d9f02db062b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC27 13284 bytes

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