Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b922dd3ac4680a…

MALICIOUS

PDF

35.2 KB Created: 2020-04-27 06:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1a5c051930a0fce4a046ef43bb4053b3 SHA-1: 50ab975d4fbe7de73cfdc929ba889332ff0cda08 SHA-256: 98b922dd3ac4680a269611e9d57c6afae20a420199a387ea529ff9aa2e70bed1
94 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm. The document body contains obfuscated text and references to 'wkhtmltopdf', suggesting it was programmatically generated to host these links. The primary intent appears to be directing users to a network of potentially malicious or deceptive websites.

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://battlecreekendo.com/uploads/1/3/0/5/130588893/130588893.html#battery+down+kd+song
    • http://potentialsc.org/uploads/1/3/1/4/131453293/degawabijaxilatato.pdf
    • http://monterreys.org/uploads/1/3/0/6/130621450/wuxagixedupo.pdf
    • http://artistsgivingbydesign.com/uploads/1/3/0/6/130621137/999523.pdf
    • http://malloyirishdanceschool.com/uploads/1/3/0/2/130272342/robebolirubusafunok.pdf
    • http://hendrixrdbaptist.org/uploads/1/3/0/5/130550982/liledilo-bevitetubanapir-rinolozer.pdf
    • http://1212journey.com/uploads/1/3/1/6/131607866/jogetifa-xefunuluxumodu-vuvizovapusini.pdf
    • http://thegraveldude.com/uploads/1/3/1/1/131164569/kevigesadokeko_kusowomazijo.pdf
    • http://earthgardenworkshop.com/uploads/1/3/0/2/130270979/tuwal-sijota.pdf
    • http://trinitydistribution.net/uploads/1/3/0/2/130289749/0c973fc6b3394bc.pdf
    • http://natrulay.co.uk/uploads/1/3/0/5/130540116/188485.pdf
    • http://locatemeasap.com/uploads/1/3/1/4/131412491/ee9cc7ef.pdf
    • http://bambooandroses.org/uploads/1/3/0/6/130604079/kumero.pdf
    • http://seedlinghospitality.com/uploads/1/3/0/7/130775475/4550752.pdf
    • http://andrewbarenconsulting.com/uploads/1/3/0/6/130605075/400721.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_off00006073.bin
6676b84dcdde4403539b7db58a2f807870e15dd2a967faddcfd66e30b075ee21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6073 8048 bytes

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