Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6eb1726f9c5cbc…

MALICIOUS

PDF

46.8 KB Created: 2020-03-12 06:39:21 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1a1607a4ab15bbfb67544fb59b877d2b SHA-1: cf01ab6112ce9cf963505b13bef62d0aba2a1a68 SHA-256: aa6eb1726f9c5cbce68fdba1973b2d88b7fca84c7f039d2035727142f31e71a3
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The primary attack pattern involves directing users to a vast array of external PDF files hosted on numerous unrelated domains.

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://adsl-63-204-18-26.benefitplans.org/uploads/1/3/0/6/130603982/130603982.html#non+verbal+communication+theory+pdf
    • http://www.travelismo.net/uploads/1/3/0/6/130621373/menajujezepexelo.pdf
    • http://tattletalesboutique.com/uploads/1/3/0/3/130379060/448e0267fc3.pdf
    • http://prestigepc.net/uploads/1/3/0/3/130313803/lelokewixagani.pdf
    • http://yogalabbet.se/uploads/1/3/0/2/130270742/cda3e5a9c1b2.pdf
    • http://jcumc.org/uploads/1/3/0/6/130620197/8952779.pdf
    • http://webmail.tsoliscompany.com/uploads/1/3/0/6/130605097/kefezogiviju-subuvimex-kilevi-ruwidekar.pdf
    • http://www.eva-uhhhh.com/uploads/1/3/0/2/130289204/59ca8b55c12.pdf
    • http://10starteam.com/uploads/1/3/0/7/130739423/robifedowimek.pdf
    • http://rebootventures.co.uk/uploads/1/3/0/4/130483765/vusawinot_xudixudixu_sikuzoxevilesox_lodojapa.pdf
    • http://www.funmotionsoccer.com/uploads/1/3/0/5/130543368/98d3556d8c557.pdf
    • http://www.modernistservices.com/uploads/1/3/0/7/130776276/c7d53.pdf
    • http://www.romboid.pl/uploads/1/3/0/5/130542758/ad0654daf9d7b25.pdf
    • http://leappdayprogram.org/uploads/1/3/1/0/131070258/felilef.pdf
    • http://www.mesayokearthworks.com/uploads/1/3/1/0/131071047/fe842226c6.pdf
    • http://www.gps-properties.co.uk/uploads/1/3/0/8/130814715/7570200.pdf
    • http://mosaicinaction.com/uploads/1/3/0/5/130588258/d097425b.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_off000078da.bin
1b952dbe2be6aa8e0165bf35897bc3cb759e4c1df2a7daf76656725c28029af3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78DA 8252 bytes
font_01_sfnt_off00009782.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9782 16036 bytes

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