Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d16df67afec5560…

MALICIOUS

PDF

46.5 KB Created: 2020-04-20 10:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2cad9e2f64538c4b4e59ac5bbac0bb31 SHA-1: 0d747cb4a720c091fa64f3215aec1c41e539005d SHA-256: 0d16df67afec5560438e6de86cb02ff0110f1be0ec75365d043caef79afcf6e6
96 Risk Score

Malware Insights

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

The PDF document is identified as malicious by an ML classifier and contains a large number of external links, many of which point to other PDF files. This behavior is indicative of a link farm or a mechanism to distribute further malicious content. The document body, though heavily obfuscated, contains a reference to an annual report, suggesting a lure to disguise the malicious intent. No scripts were extracted, but the heuristic firings strongly suggest a malicious intent related to link manipulation and potential content delivery.

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://bwesllc.com/uploads/1/3/1/3/131382491/131382491.html#cimb+group+holdings+bhd+annual+report+2018
    • http://shadesbyfindley.com/uploads/1/3/0/7/130776126/5578267.pdf
    • http://bridgeandbroad.com/uploads/1/3/0/7/130775590/zadolajidizez.pdf
    • http://geeladesign.com/uploads/1/3/0/3/130324037/jisuwofutokadodilaje.pdf
    • http://codltb.com/uploads/1/3/0/6/130639052/2b0510f7cd1a.pdf
    • http://itsillmatter.com/uploads/1/3/0/2/130271058/4233717.pdf
    • http://arts608.com/uploads/1/3/0/2/130289385/e90280f1.pdf
    • http://allancapital.ca/uploads/1/3/0/9/130969953/seropafuzav-sikojoges.pdf
    • http://securitydoorssunshinecoast.com/uploads/1/3/0/7/130776487/luziw_delat_xowaposotujuma.pdf
    • http://astontcvhospital.com/uploads/1/3/1/0/131070045/7127726.pdf
    • http://casaedizioni.net/uploads/1/3/0/6/130604685/79b656e.pdf
    • http://thedenabilene.com/uploads/1/3/0/5/130588701/2a9591701.pdf
    • http://headstashproducts.com/uploads/1/3/1/1/131163540/4fac99ec604d.pdf
    • http://howtogetyourbradentonhomesold.com/uploads/1/3/0/3/130313114/8395489.pdf
    • http://raymondjustice.org/uploads/1/3/1/4/131406173/tegiki-kudiseti-bidurojotiw-menuvabisaro.pdf
    • http://casesessions.com/uploads/1/3/1/1/131163788/sizevitev-nijamoramise-kifosenunavujep.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_off00008d27.bin
7217ef478740eace3a193ff4b434b6f02abbc97ebe78a527137de0249302360f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D27 8424 bytes

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