Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf765ad76fa8aca…

MALICIOUS

PDF

40.6 KB Created: 2020-06-15 10:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9b1672c7be128a6e64053539e1d1a2f SHA-1: 4abf3f15f84c4bce196a40d505d634be014f6f24 SHA-256: 3bf765ad76fa8acacc4c42cd51be11cb2229cc9799f91463195f9115f69c1334
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The document body mentions 'Hp scanjet 300 pdf', likely a lure to entice users to click on the embedded URLs. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. No scripts were extracted, but the PDF structure and embedded URLs suggest a phishing or redirection attack.

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://theyearofradicalchange.com/uploads/1/3/0/2/130287946/130287946.html#hp+scanjet+300+pdf
    • http://amm.hqafaf.org/uploads/1/3/0/4/130483138/zajel-woboxoz-zorazosokel-lavinomigoseb.pdf
    • http://surenreddy.com/uploads/1/3/0/7/130738993/vevag.pdf
    • http://useretiredattorneys.com/uploads/1/3/1/4/131437604/vibuzaja-laborexovaw.pdf
    • http://ontime247.net/uploads/1/3/0/6/130639760/xetagiwasadurel-tegopolodi-neremetifuteke.pdf
    • https://mugitemos.files.wordpress.com/2020/06/vajelujupujatoludu.pdf
    • https://tipaxoxabenu.files.wordpress.com/2020/06/rajinivazekatigawum.pdf
    • https://nudokux.files.wordpress.com/2020/06/69275891472.pdf
    • https://kuwinekej.files.wordpress.com/2020/06/32309150315.pdf
    • https://serufefiper.files.wordpress.com/2020/06/gitoxidepuvumipizejutimu.pdf
    • https://tomozajip.files.wordpress.com/2020/06/68620858113.pdf
    • https://gomumutuweno.files.wordpress.com/2020/06/73027162207.pdf
    • https://lasogotunule.files.wordpress.com/2020/06/5647408361.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007095.bin
a7d4432a0ed671a822f2502ce3d91588adb646b19d9c63b25fcc622e9c77de23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7095 13060 bytes

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