Malicious PDF — malware analysis report

Static analysis result for SHA-256 7168ecfd22209d2d…

MALICIOUS

PDF

40.1 KB Created: 2020-04-14 16:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f364e78efafa1948420beba5f1111081 SHA-1: 485c4e91017f9b35dfd0f3dc6fa6c9e8d615f403 SHA-256: 7168ecfd22209d2d39d469233a8d3f830b770524110badebceac6a4acea354e0
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating it is part of a link farm or SEO scam designed to drive traffic to various websites. The document body, though heavily obfuscated, contains a title related to communication barriers, which is likely a lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

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://referral360network.com/uploads/1/3/0/6/130620677/130620677.html#barriers+and+breakdown+in+communication+pdf
    • http://myshopblack-educated-co.com/uploads/1/3/0/7/130775422/21af64270.pdf
    • http://ajltech.co/uploads/1/3/0/6/130604984/dad3a949fe.pdf
    • http://sanctifiers.com/uploads/1/3/0/4/130477566/e2404adcdf97.pdf
    • http://tdmhydraulics.com/uploads/1/3/0/6/130621401/6188498.pdf
    • http://teludynecustomshop.com/uploads/1/3/0/6/130620185/xexiwuvajogeb.pdf
    • http://photogamut.net/uploads/1/3/1/4/131406284/karuv-nagagosiza.pdf
    • http://kimberlysimpkins.net/uploads/1/3/0/3/130313403/5619669.pdf
    • http://www.alexisarenas.com/uploads/1/3/0/7/130775850/8935295.pdf
    • http://thekeysmith.club/uploads/1/3/0/6/130604508/ramodufo.pdf
    • http://chrispinkvideo.com/uploads/1/3/0/7/130775985/9951324.pdf
    • http://hartjang.com/uploads/1/3/0/9/130969814/0db81d906.pdf
    • http://stephensayegh.com/uploads/1/3/0/6/130620807/bumitelusumutud.pdf
    • http://kigerlaw.com/uploads/1/3/0/5/130539085/bixukezupitiput_xevamuka.pdf
    • http://globalmacrocapitalmanagement.net/uploads/1/3/0/3/130323405/famofuboz.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_off000076e6.bin
4dddae0ab4c4600c070fa77ca03409cddefd708d669aae2de233146eaa02dc04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E6 7548 bytes

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