Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd773c8e332aaae…

MALICIOUS

PDF

48.1 KB Created: 2020-03-17 17:02:58 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 164511ef6a4153c02fe1f7cc0b384c1c SHA-1: 513867e3bd948bf9f5b715314443515d647d6966 SHA-256: afd773c8e332aaae0fa4dfa9a11c5225a69e690fb1ce5077c34c7ba7b2d911a5
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains. This pattern is indicative of SEO spam or a link farm used to distribute malicious content. The ML classifier strongly supports the malicious verdict. 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://malibuequipmentsupply.com/uploads/1/3/0/8/130813135/130813135.html#lactancia+materna+diapositivas+pdf
    • http://wormshare.com/uploads/1/3/0/2/130289279/8569453.pdf
    • http://www.smellicioussoaps.com/uploads/1/3/0/6/130604848/9c79b5.pdf
    • http://therubinfamily.me/uploads/1/3/0/5/130551013/siparajabodugomoki.pdf
    • http://cpanel.fountainheadrandm.com/uploads/1/3/0/6/130622093/6866fe1d9048233.pdf
    • http://middlesistercocktails.net/uploads/1/3/0/8/130814106/0be51181182.pdf
    • http://ns3.waterswheel.org/uploads/1/3/0/6/130620424/daxiw-lurumarip-wugowaxu.pdf
    • http://www.filmwerft.de/uploads/1/3/0/4/130476244/7349850.pdf
    • http://rrrofsouthla.com/uploads/1/3/0/7/130740200/kexenare_talal_bewusum.pdf
    • http://dealer.fusiontacticalusa.com/uploads/1/3/0/7/130775171/fevigapabojix-vokimodolup-gepusojimim-muded.pdf
    • http://matlockgasandequipment.com/uploads/1/3/0/5/130551670/9517440.pdf
    • http://baihehuiyulecheng.br3h.com/uploads/1/3/0/6/130621178/sofuponovigerawis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a45.bin
af6745a46945c5aa7cc8639f70564046c969a7dcc7705f40594f2e076e04774f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A45 2396 bytes
font_01_sfnt_off0000843e.bin
5ee049ec270f7e4160108569d209b4fb9072b5d9e070a7b2e97a117e423bed26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x843E 9772 bytes
font_02_sfnt_off0000a6e7.bin
4d9ec2aec8f1ca6bebe1b56492fd55a77bba3a6e98efb76508c1b835d4eb9912		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6E7 2860 bytes

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