Malicious PDF — malware analysis report

Static analysis result for SHA-256 80855a6f70af7ef0…

MALICIOUS

PDF

68.3 KB Created: 2021-03-08 15:36:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c9fb0ccf09faf7a433b8081231a9cc1 SHA-1: 2780256e24348b800faf2f37585c4e5538a0913e SHA-256: 80855a6f70af7ef09a93ea3772e2847f2cbde55206d34463d92aa4e8f0e3d3e2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with a critical heuristic identifying a link farm designed to redirect users to other sites. The document body, though heavily obfuscated, contains text related to a movie title and mentions 'wkhtmltopdf', suggesting a lure to a potentially malicious website. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://botokaw.ru/123?utm_term=bullet+raja+full+movie++in+tamil
    • http://bagerisevi.scienceontheweb.net/bowanudajiralupef.pdf
    • https://cdn-cms.f-static.net/uploads/4473035/normal_604366a1bc2fc.pdf
    • http://ponaxamewimenul.sportsontheweb.net/how_to_reduce_into_smaller_size.pdf
    • https://cdn-cms.f-static.net/uploads/4456389/normal_60135a8da3e85.pdf
    • https://cdn-cms.f-static.net/uploads/4426075/normal_601bf903cc9c0.pdf
    • https://cdn-cms.f-static.net/uploads/4491433/normal_60431a1d9adde.pdf
    • https://cdn-cms.f-static.net/uploads/4408983/normal_6032c39026619.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_db0b460a942d471586ca3a9b4b15c7c9.pdf?index=true
    • https://s3.amazonaws.com/jawusawar/40207932233.pdf
    • https://s3.amazonaws.com/litunux/will_bleach_get_blood_off_white_sheets.pdf
    • http://nabenejajoko.myartsonline.com/36980262200.pdf
    • https://uploads.strikinglycdn.com/files/27546871-60c8-4336-bb22-d441e334aaff/2002_ford_ranger_manual_transmission_fluid_type.pdf
    • https://uploads.strikinglycdn.com/files/3ed048e8-0fbf-4498-9ea4-6334ffa34219/danitererepajekolanasubur.pdf
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_77f0bb864ac64c499a1c3f94b32610ee.pdf?index=true
    • https://s3.amazonaws.com/ninasivol/will_eugene_oregon_get_snow_this_winter.pdf
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_663f07e9c3ba4c2b81b1fdcc0f955c8e.pdf?index=true
    • http://wojibikifi.myartsonline.com/how_do_you_pray_the_peace_rosary.pdf
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_f7b61b3c39d64e6ca3dacde223eadf08.pdf?index=true
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc15.bin
0d3491f90264bb1b2b48f154816fd6c0edf79c1926bfb3d86d34b6da85ecb8dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC15 4920 bytes
font_01_sfnt_off0000dcc7.bin
72e24d0584aa5efe443ae3fddea8ab7157ea2cff76096c12a359df3f0155e14a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 11056 bytes

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