Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07bbe21678b1ea9…

MALICIOUS

PDF

36.8 KB Created: 2020-04-23 04:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cea443c8b7a77dab9d4c439f7671a2bb SHA-1: b330c0a518dd6d4fa375bc70cdbd24797fa66680 SHA-256: b07bbe21678b1ea980c24692b844ed89c8e4fcc2161da0cdf7f16a1f93f9344b
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm, designed to direct users to potentially malicious content. The presence of multiple URLs pointing to PDF files and HTML pages suggests a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://iamkingbagi.com/uploads/1/3/0/6/130604249/130604249.html#busybox+jrummy+apk
    • http://trtees.com/uploads/1/3/0/4/130476760/7740714.pdf
    • http://eeoworkplacestrategies.com/uploads/1/3/0/8/130814124/9682227.pdf
    • http://hellobrynnpuzey.com/uploads/1/3/1/1/131164223/8c5467b52056f.pdf
    • http://howevermanydays.com/uploads/1/3/1/3/131379168/dfa96d1042a8e.pdf
    • http://thereimagining.net/uploads/1/3/0/4/130475883/3253173.pdf
    • http://msonormal.org/uploads/1/3/1/6/131607544/jepiwesanus.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_off0000699f.bin
bdf412ff73da8da803ddafa6ad95eed20827473f91a7daa1d7c70b50634aa489		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699F 7764 bytes

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