Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f95bd8cf68b095e…

MALICIOUS

PDF

75.0 KB Created: 2021-03-20 07:00:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f85e4b7f649f9d9abc26eaad6d44d087 SHA-1: f6966d661c817f97950eebfa607142353f85903f SHA-256: 0f95bd8cf68b095e3557a7f57884aada153b55fb6c0c7c2d574191d271b393a9
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, with a critical heuristic firing for 'PDF_SEO_LINK_FARM'. One of the primary URLs, 'https://nipisod.ru/123?utm_term=capture+one+8++mac', suggests a potential phishing lure related to software or a service. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/123?utm_term=capture+one+8++mac PDF link annotation
    • http://film123watch.com/how_to_change_volume_on_sony_tv_without_remoteu81dr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410194/normal_5fd7a54177a07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384463/normal_602a20559ff99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446494/normal_5fc599cddd025.pdfIn PDF document text
    • http://hookup153.online/70010169175l17eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450512/normal_60536d2105702.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413718/normal_5fe2cbd37cf1c.pdfIn PDF document text
    • http://vilopeg.xyz/jump_on_it_my_pony_magic_mikey3529.pdfIn PDF document text
    • https://karegito.weebly.com/uploads/1/3/4/6/134626514/bezowudekam.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/3Th6gex/cut_3d_model_3ds_max.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485818/normal_602542cbe47d3.pdfIn PDF document text
    • http://netewe8.xyz/sumixavivazuht8qu.pdfIn PDF document text
    • https://kojegowi.weebly.com/uploads/1/3/4/6/134685768/d8e94c45dfbafe0.pdfIn PDF document text
    • https://cdn.sqhk.co/pasededi/Gghhchb/how_to_do_knock_down_texture_on_walls.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/ditulegf59ns.pdfIn PDF document text
    • https://cdn.sqhk.co/nimabugokofa/ijcnTib/27391888021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458625/normal_604124732bd12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461249/normal_5fe351e7378ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_a9c4fce93ab747f38d6acf694df168fb.pdf?index=trueIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_2db29128c1f94b1384ea5d318ab4133c.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_d75649cfcb2147ba83cb6160b9c34e5e.pdf?index=trueIn PDF document text
    • https://43e3b293-20b6-4b74-9f7d-0eefffb4d2df.filesusr.com/ugd/11595e_782c482119d24113a6c56520db1ffda2.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 4968 bytes
SHA-256: fa4ba8c523324eba6855d81de3b18f15ee2ebae941c50e7cd1dc5b0cc0b595c8
font_01_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 11148 bytes
SHA-256: 60bbbc69e867f08f3007f47209523d6b614ffd37eab0b08fee63d35ba9d63504