Malicious PDF — malware analysis report

Static analysis result for SHA-256 444ff01aeb6a8360…

MALICIOUS

PDF

31.5 KB Created: 2020-06-20 14:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7b507edc534e65fae4626feb044f9ab SHA-1: 882a56905cdb37d62a4566139cf9cd4bdfa0ee02 SHA-256: 444ff01aeb6a8360fcc5cd93de48026d9a976bd179f340d3fd24f686fa10c2c7
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, suggests a lure related to 'Mixed modal exercises'. The primary attack pattern involves directing users to a network of suspicious websites, likely for phishing or malware distribution. No scripts were extracted from this sample.

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://gotcologne.com/uploads/1/3/0/2/130273812/130273812.html#mixed+modal+exercises
    • http://littledivas.net/uploads/1/3/0/8/130814349/2416a5ee17.pdf
    • http://phoying.net/uploads/1/3/2/3/132302987/dc241624415a324.pdf
    • http://webmail.shrikirent.co.il/uploads/1/3/0/6/130620529/famipegasix.pdf
    • http://whitesburgestates.org/uploads/1/3/0/8/130874364/1889927.pdf
    • http://crystalscandle.com/uploads/1/3/0/6/130622104/sowugufufowot-felejokubum-toluso-rulitisizizave.pdf
    • http://myearthbistro.com/uploads/1/3/0/5/130543648/1892256.pdf
    • http://monsoonsail.com/uploads/1/3/0/2/130289429/39b85a7f8fbd9.pdf
    • http://rootsraizesbrasileiras.com/uploads/1/3/0/5/130543402/kumizafamadado_dikusorozegisiv_fimajuzeraxufon.pdf
    • http://iglooimages.com/uploads/1/3/1/4/131407316/8106737.pdf
    • http://takethecakebakery.com/uploads/1/3/1/6/131607544/tamaxifefuremar.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_off00003f21.bin
f94f4fe0e660ec5926075b03d5b5ef49cff0165bb992da91876553778b36513b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3F21 4760 bytes
font_01_sfnt_off00004f4a.bin
952b4bf6019520ddefc6c7f6da3f8748912837ba02e07c6c9373404930a9eab8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F4A 10264 bytes

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