Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b5ae30e9b993ba3…

MALICIOUS

PDF

35.0 KB Created: 2020-04-22 07:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: faba5d509dc6d8c058908a86e5c2cc18 SHA-1: 1cc72a258bbd96c4b898cedba3585119116dec84 SHA-256: 1b5ae30e9b993ba310c7e1c3ea826e309ca3cdaa16e2e25ebc850fd21ec59da6
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources. The ML classifier strongly indicates maliciousness. The presence of a large number of external links, many with numeric slugs, suggests an attempt to manipulate search engine results or host malicious content on seemingly innocuous domains. The primary attack pattern involves luring users to these external sites.

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://paxcristina.com/uploads/1/3/0/8/130814226/130814226.html#types+of+adjectives+worksheets+for+grade+4
    • http://toruscleanenergy.com/uploads/1/3/0/6/130639906/3164395.pdf
    • http://elvshop.fr/uploads/1/3/0/7/130738614/c887f3.pdf
    • http://fullsoulstudio.com/uploads/1/3/0/4/130490410/6358091.pdf
    • http://staurfoods.net/uploads/1/3/1/4/131409017/4213696.pdf
    • http://repulsebaygardens.com/uploads/1/3/1/0/131070318/5471412.pdf
    • http://canergoktas.com/uploads/1/3/1/6/131637073/zaroveradetudid-rezeku-dabudo.pdf
    • http://abbythomas.wedding/uploads/1/3/0/8/130874109/7a62ecc913e1a.pdf
    • http://funtiff.com/uploads/1/3/1/4/131437170/194142.pdf
    • http://jasonshadowen.com/uploads/1/3/0/3/130379183/08a32826c9.pdf
    • http://mountaingirlbeauty.com/uploads/1/3/1/3/131379069/9180820.pdf
    • http://remodelinghero.org/uploads/1/3/0/6/130620801/3741633.pdf
    • http://hoipolloibrewingshop.com/uploads/1/3/0/6/130639860/fifofoze.pdf
    • http://valdineschroeder.com/uploads/1/3/0/9/130969679/pujozeguwa.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_off000061a0.bin
d03f2c06b8b612068c603324fa29cf2081857e6154419d5a1de4c961f159464a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A0 7776 bytes

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