Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb39df94d373c0e…

MALICIOUS

PDF

40.9 KB Created: 2020-04-08 23:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d3e659a305b13470d35e875643675ee0 SHA-1: a75d08fd9fa642d4feb9adb4034b41f8b8826403 SHA-256: 3bb39df94d373c0e1e63161345b46301982f408f63237fb050db2373c43ba5b8
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to similarly structured URLs on different domains. The document body, though partially garbled, includes the text 'Jak vyrobit domáci dYevn xylofon' and a URL that appears to be a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute malware or conduct phishing by directing users to potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xciteeducation.com/uploads/1/3/0/7/130740183/130740183.html#jak+vyrobit+dom%C3%A1c%C3%AD+d%C5%99ev%C4%9Bn%C3%BD+xylofon
    • http://mcdanielperformanceproducts.com/uploads/1/3/0/4/130489475/7caead2.pdf
    • http://bmsecure.org/uploads/1/3/0/7/130740571/vasidisevazixu.pdf
    • http://chevalier-finance.ch/uploads/1/3/0/5/130588434/rabuvew.pdf
    • http://chemistrybeats.com/uploads/1/3/0/6/130639884/tuborurimur.pdf
    • http://thecarbonsequester.com/uploads/1/3/0/6/130605075/vakodogem_romutux_gapafeme_fobiret.pdf
    • http://asecondhomedogcare.com/uploads/1/3/0/4/130436299/zakegijox-sedixe-fokivobivan.pdf
    • http://hasaicogroup.com/uploads/1/3/1/0/131069987/8973546.pdf
    • http://thefriendlybird.com/uploads/1/3/0/5/130589133/muvawiwodibafanala.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_off000074e0.bin
5a9ccc53d64ac32e8cb24883a703d28c121832cf552a14dc8d15a38554fac8c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E0 9344 bytes

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