Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c73cdc0598bb5d7…

MALICIOUS

PDF

29.6 KB Created: 2020-04-29 02:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e83551ec62755488e5aee02a8a924625 SHA-1: 5f94202f99f90a790313f3d81cc74b6e2c3657b8 SHA-256: 8c73cdc0598bb5d7952a7fc85524d044963f9766a982a0f69e0da1cca27d21a5
96 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The embedded URLs point to domains that appear to be part of a link farm, suggesting a tactic to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://parlorbearcandleco.com/uploads/1/3/0/5/130589435/130589435.html#capita+linguist+timesheet
    • http://jacobjmorris.com/uploads/1/3/0/2/130272395/8530c38df1.pdf
    • http://visionsofadventure.com/uploads/1/3/0/6/130622047/nidolujejukef-sulemure.pdf
    • http://cofitpro.com/uploads/1/3/0/4/130488810/nebuxafuperop_mavekegeviwa_lodolopusul_ribigabuvo.pdf
    • http://childimmersionacademy.com/uploads/1/3/1/1/131164210/sovikovoxewusije.pdf
    • http://acutecareanesthesia.com/uploads/1/3/0/8/130813558/defimudizob-jivimojob-rabadopovuxo-wozozenajezeziw.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_off00004dfa.bin
b806bf68ab71f42b7aa55fbd67f4ba7045ae1fa0529771186d5cfd1b7e344a70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DFA 7388 bytes

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