Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a936762f3457d5…

MALICIOUS

PDF

50.2 KB Created: 2020-04-07 13:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 25fd560ee7d62a3329788953e9749267 SHA-1: abc38701c7f9aa6af4b3cacff2220bd7c3f221e8 SHA-256: 18a936762f3457d5d8c41e5027eef0ab1ac09d8612d7213be3f70debe19ef391
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF document exhibits characteristics of a link farm, embedding a large number of external URLs. The primary heuristic indicates a mass of external PDF links, suggesting a tactic to manipulate search engine results or redirect users to potentially malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://globalinternationaltradingllc.com/uploads/1/3/0/2/130271167/130271167.html#escuela+secundaria+tecnica+39+jesus+reyes+heroles+nezahualcoyotl
    • http://alyssabousquet.com/uploads/1/3/0/3/130313459/vozik.pdf
    • http://vlasotince.net/uploads/1/3/0/6/130639889/429031.pdf
    • http://panaderostoves.com/uploads/1/3/0/7/130775752/7274053.pdf
    • http://coslogalliance.net/uploads/1/3/0/7/130740524/8105db.pdf
    • http://bcpsllc.com/uploads/1/3/1/3/131398099/32504cd4d9.pdf
    • http://complimaxllc.com/uploads/1/3/0/5/130540814/lakeforul_walovatu.pdf
    • http://hillsboroplumbersor.com/uploads/1/3/0/5/130539416/f30e280307353.pdf
    • http://lloweandassociates.com/uploads/1/3/0/8/130874369/dizalipezafoxupevi.pdf
    • http://deluxefrenchfries.net/uploads/1/3/0/2/130287893/2416380.pdf
    • http://repsaved.ca/uploads/1/3/0/7/130739021/6e97a4c2e35.pdf
    • http://biobuilderlearninglab.org/uploads/1/3/0/4/130476678/542e105b66fd6.pdf
    • http://myhiphome.com/uploads/1/3/1/1/131163876/287ef79518922.pdf
    • http://magnoliawrenltd.com/uploads/1/3/0/3/130313167/fajuwuvipa-ninavasod-mawakuwiri-logeruzosevagem.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008089.bin
26db763b0472a29b7302e882e278ea9b3f9560aa5f6a97705c71d9c4d2ab572c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8089 10128 bytes
font_01_sfnt_off0000a417.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA417 16036 bytes

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