Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc13f343e48131bb…

MALICIOUS

PDF

54.2 KB Created: 2020-04-02 23:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eb3aa823f2d624155d427d735d9b6685 SHA-1: bfc86536b15b67ba1bbc61e12f7493e17600bb4a SHA-256: fc13f343e48131bb012eb8daef0362490ad067169d2a6b231f7415dc2117c8be
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm, suggesting a lure to a large collection of external PDF files. No scripts were extracted, and the primary malicious activity appears to be the distribution of links.

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://iamsarahneill.com/uploads/1/3/1/1/131164066/131164066.html#raumplan+adolf+loos
    • http://apexprodue.com/uploads/1/3/1/3/131398285/420470.pdf
    • http://interlan.biz/uploads/1/3/0/6/130604732/7788842.pdf
    • http://maaloufenterprises.com/uploads/1/3/0/2/130272318/6ae29845b4a8.pdf
    • http://ntr4cbd.net/uploads/1/3/1/4/131409909/7460432.pdf
    • http://ddd-displays.com/uploads/1/3/0/8/130874400/naluwep.pdf
    • http://leaningsilo.com/uploads/1/3/1/3/131379536/zimunixake.pdf
    • http://homestayinirishfamilyhome.com/uploads/1/3/0/9/130969628/3103709.pdf
    • http://hire-text.com/uploads/1/3/0/4/130483110/620c3e8.pdf
    • http://sacredcirclecounseling.com/uploads/1/3/0/8/130814063/dobejorutuvakamel.pdf
    • http://newarkvalleychamber.com/uploads/1/3/0/2/130287513/3245967.pdf
    • http://myvita.net/uploads/1/3/0/3/130313513/3929683.pdf
    • http://2chiiki.com/uploads/1/3/0/5/130548070/vurefiga_bogavevak_fujovunugam.pdf
    • http://whatsheet.com/uploads/1/3/0/6/130620857/8436264.pdf
    • http://angelsfire.net/uploads/1/3/0/5/130551907/potejeg_wuduverosegi.pdf
    • http://lotusblossomfarm.com/uploads/1/3/0/7/130740089/1160230.pdf
    • http://ecohealthbeauty.com/uploads/1/3/0/6/130620772/66e5e0aa864.pdf
    • http://gogoreadgo.com/uploads/1/3/0/7/130776647/zexifirulatabonuj.pdf
    • http://newlookeyebrowsandspa.com/uploads/1/3/0/6/130604787/71d164b3e.pdf
    • http://skybossaerials.com/uploads/1/3/0/8/130873853/7032554.pdf
    • http://mjflickdesign.com/uploads/1/3/0/7/130739028/2028898.pdf
    • http://ecuriebarnton.com/uploads/1/3/0/9/130969220/9486420.pdf
    • http://coachingmetabolico.com/uploads/1/3/1/1/131164159/fesured-kuzumufa-jiguguzudidolap-gugawo.pdf
    • http://livenation.implementation.collectivehealth.com/uploads/1/3/0/5/130588895/5376445.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_off000093db.bin
35d9e44463d6bde2f98fa4727e2d81d041713e7bc0a9ed38ac0d4eae559a0dda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93DB 9624 bytes
font_01_sfnt_off0000b548.bin
ff9ba94af27f6018dbba330fdeac6961a462cc628ac25730121c6bb5e08f64cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB548 16228 bytes

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