Malicious PDF — malware analysis report

Static analysis result for SHA-256 0202f5f71583e074…

MALICIOUS

PDF

46.7 KB Created: 2020-03-22 06:32:05 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a5313bf11e5a4289c54a8e71fde8339f SHA-1: 63ce21bd20c5eca065fb1c43eec72f220516e337 SHA-256: 0202f5f71583e0743a53e56b97c4b143baeb3bd7d94e15fd834dac6a778f2839
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or content distribution network. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://resmotors.net/uploads/1/3/0/6/130603922/130603922.html#why+students+don%27t+like+wearing+school+uniforms
    • http://moheal-moringa.com/uploads/1/3/0/5/130551331/8642103.pdf
    • http://vind-t.com/uploads/1/3/0/6/130620849/vigubuw.pdf
    • http://laceyandleatherexoticattirellc.com/uploads/1/3/0/5/130590036/jobazawokedax_delegiropapago.pdf
    • http://thesussexcollection.com/uploads/1/3/0/6/130620687/baroragavalo-bilemubojipanu-gifokoxonikowog-wakase.pdf
    • http://briarlakeforest.com/uploads/1/3/0/8/130813400/bupekap.pdf
    • http://rb.ramonbullard.com/uploads/1/3/0/3/130313141/9156634.pdf
    • http://www.kimcopywriting.com/uploads/1/3/0/7/130776164/b93584e11.pdf
    • http://morganmeyersva.com.au/uploads/1/3/0/4/130477090/3992154.pdf
    • http://morethanapipeline.org/uploads/1/3/0/8/130814877/4950854.pdf
    • http://investimentoecon.com/uploads/1/3/1/0/131070574/mududulaxuxisel.pdf
    • http://darlingtonteapartyrental.com/uploads/1/3/0/5/130539992/domewuparis.pdf
    • http://meetlia.net/uploads/1/3/0/5/130540645/juwivesuvona_vejazafef.pdf
    • http://ekdesignerforum.com/uploads/1/3/0/6/130639721/visasalel.pdf
    • http://webmail.marketplacemortgage.com/uploads/1/3/0/3/130323556/1160351.pdf
    • http://savinggraceacademy.org/uploads/1/3/0/3/130323485/2846305.pdf
    • http://www.lizbelderlaw.com/uploads/1/3/0/6/130621185/76499.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_off0000769a.bin
5d5152e47f8b4781a4a8874978888c7b77fa50886eeca40ed364c897fbbd1c9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x769A 8172 bytes
font_01_sfnt_off00009645.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9645 16036 bytes

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