Malicious PDF — malware analysis report

Static analysis result for SHA-256 7429e1a352d393df…

MALICIOUS

PDF

40.4 KB Created: 2020-04-15 13:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 33dd46d3ccfbd0a6e0123f36252b1ba7 SHA-1: 6981e6204b8537d14034e12fcdebbe0a69b5ed13 SHA-256: 7429e1a352d393dfedc3a2fb11d19ecee87ce8fa4ffe098d7b510db93e357296
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to host malicious content or distribute malware. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a 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://roxinstallations.com/uploads/1/3/0/7/130775134/130775134.html#best+cv+template+for+software+developer
    • http://tickshounds.com/uploads/1/3/1/4/131453174/c1c220a27f3a29.pdf
    • http://bigskyfrenchbulldogs.com/uploads/1/3/0/6/130603782/latasejapuw_bunafamepeviw.pdf
    • http://gaskeun.com/uploads/1/3/0/5/130588417/3171602.pdf
    • http://ccitpl.com/uploads/1/3/1/4/131453593/wikotesalejez_denoxepesazux_sugebidopemoxet.pdf
    • http://b2c.musicards.eu/uploads/1/3/1/3/131398244/nadimotefizar.pdf
    • http://glendaorr.net/uploads/1/3/1/4/131437683/sodamanuwinadof_nozemovatoriboz_fabibomoji_senalelow.pdf
    • http://myfirstchicken.com/uploads/1/3/0/7/130740260/9abbdf42d5287.pdf
    • http://schsaphg.com/uploads/1/3/0/5/130546717/8654711.pdf
    • http://originalkashmir.com/uploads/1/3/0/6/130604093/rasabewumupilis.pdf
    • http://swifthop.net/uploads/1/3/0/3/130324050/pobina_libajepesoju_leroj.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_off00007332.bin
0748e7b685f33857afdcf47c04bb35843843c1d11716e338840adb636b2bbef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7332 9144 bytes

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