Malicious PDF — malware analysis report

Static analysis result for SHA-256 088b8baf5c943d3d…

MALICIOUS

PDF

46.1 KB Created: 2020-03-08 01:01:43 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a54e85eeaa06eea89e3d2269a78af992 SHA-1: 23c51cbf6ca5de89fa1676870b0e47fc6d663106 SHA-256: 088b8baf5c943d3dc2ebe705a09bcc2a0ced9d685622e39d489eab37a47fbe51
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links is suspicious. No scripts were extracted, but the sheer volume of outbound links points to a malicious intent to redirect users to potentially harmful content.

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://819.bpmtc.com/uploads/1/3/0/3/130379087/130379087.html#ehlers+danlos+syndrome+periodontitis
    • http://modemarketingsolutions.com/uploads/1/3/0/6/130603932/b5ad083e5f.pdf
    • http://www.loseweightfasthow.com/uploads/1/3/0/2/130272504/lubajud.pdf
    • http://ejernd.com/uploads/1/3/0/2/130289173/tejusaxesegu.pdf
    • http://newwaveflowers.com/uploads/1/3/0/4/130494801/8304391.pdf
    • http://seeme4sex.net/uploads/1/3/0/2/130273733/metogesekixoxugi.pdf
    • http://www.jenandlusfoodnews.com/uploads/1/3/0/8/130874252/3770386.pdf
    • http://donotdemonetize.com/uploads/1/3/0/4/130483959/d31d2e02e6aa9.pdf
    • http://gearaddiction.org/uploads/1/3/0/6/130640071/midezofajiderixatag.pdf
    • http://locksmithwaukesha.com/uploads/1/3/0/6/130622104/wenopaki.pdf
    • http://mountephraimtaxpayersfirst.com/uploads/1/3/0/3/130323959/vilajij.pdf
    • http://anuqa.net/uploads/1/3/0/4/130483638/3077293.pdf
    • http://robyntapley.com/uploads/1/3/0/8/130813756/8553357.pdf
    • http://malikriddle.com/uploads/1/3/0/5/130541351/b5b841526777b.pdf
    • http://cageymooncompany.com/uploads/1/3/0/6/130604354/gapinulofuwi.pdf
    • http://minagcapital.com/uploads/1/3/0/6/130621353/3949220.pdf
    • http://productionfront.net/uploads/1/3/0/8/130813658/kasedetufon_sodobilo_mawiwilovuz.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_off00008e5b.bin
a1e407dc6c97ebc0a6aa36d288317e9d7b4cfed2d0cd65871b2b4c663333d45b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E5B 7304 bytes

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