Malicious PDF — malware analysis report

Static analysis result for SHA-256 62d0b9ca292a8b08…

MALICIOUS

PDF

39.5 KB Created: 2020-06-21 19:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 660a9e68db7e31406b81d430843d401c SHA-1: 0d5c2aa7bcb6083fd38d2bc475c27740344620ce SHA-256: 62d0b9ca292a8b08f61b5e75dddd3323043f4de6a12f73eb40567022725c050c
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, disguised as a user manual, which is a common tactic for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the sheer volume of external links points to a high likelihood of malicious intent.

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://living-twenty.com/uploads/1/3/0/8/130813973/130813973.html#canon+3ccd+gl2+user+manual
    • http://holisticsound.com/uploads/1/3/0/8/130813787/kimonare-paporokulunekin.pdf
    • http://smallportableobjects.com/uploads/1/3/0/6/130639675/4a238.pdf
    • http://milanfamilies.com/uploads/1/3/1/4/131452884/cfbdf285efe9ae.pdf
    • http://mta-sts.mail.meetthemessenger.com/uploads/1/3/0/9/130969221/2966009.pdf
    • http://hostmaster.longnuoicongnghiep.com/uploads/1/3/1/3/131384226/gabozuj.pdf
    • http://solesbeeco.com/uploads/1/3/1/4/131452733/favezutufojel_rulivefasevo.pdf
    • http://socialbugs.online/uploads/1/3/0/6/130621950/6554348.pdf
    • http://mailfilter.sry.com.tw/uploads/1/3/0/5/130551856/sipevivu_niruga_wuxafadaxoli.pdf
    • http://welchforschoolboard.com/uploads/1/3/0/6/130620240/zegib.pdf
    • http://theastroimagingchannel.com/uploads/1/3/1/6/131637171/wafisi.pdf
    • http://easthavenrotary.org/uploads/1/2/9/4/129458896/129458896.html?d-
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c31.bin
932ad059fa19599934fe3d2d456509e3b6cd3f62bca8fb114eaeaf54c93e6f31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C31 5332 bytes
font_01_sfnt_off00006e2c.bin
1fc164bbd6618ced8c54c6a1f5f5af19870c1aa67b60452608b17628b48ef999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2C 10456 bytes

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