Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c337a6bbaf5344c…

MALICIOUS

PDF

81.4 KB Created: 2021-03-24 13:07:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d03122b4e3b065e2b6a4081bf8b73b04 SHA-1: a66ebff0b132f6e5a29cc4573fcc1fab103c0158 SHA-256: 7c337a6bbaf5344ced4d99a44f8c966894f7530616abd45cfa7e31e62f0bdf7b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://jumiwimov.ru/strik?utm_term=little+fires+everywhere+last+episode+recap, is likely part of a phishing or traffic-driving scheme. No scripts were extracted, but the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=little+fires+everywhere+last+episode+recap PDF link annotation
    • https://nuguzawopaji.weebly.com/uploads/1/3/4/0/134040365/sofupenisamana_punir_raxovopatuligor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484805/normal_5feb08424e2c4.pdfIn PDF document text
    • https://zepazilarewar.weebly.com/uploads/1/3/4/3/134310653/febogotorit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446645/normal_6002487535fbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470400/normal_6003b30c55c6a.pdfIn PDF document text
    • https://tenaxujapem.weebly.com/uploads/1/3/4/3/134341928/vofopepi_zunural.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484997/normal_601998436fe1a.pdfIn PDF document text
    • http://xuzugukow.iblogger.org/zarejetusoduzef.pdfIn PDF document text
    • https://rilulukopidu.weebly.com/uploads/1/3/5/3/135323077/jebixoteb-kozezorulik.pdfIn PDF document text
    • http://renosivegegev.iblogger.org/49082715822.pdfIn PDF document text
    • https://kijatuvoriwoze.weebly.com/uploads/1/3/4/3/134352029/tusupexe_zirajawutat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_f67c9f39ced744ac89db7655c9b8d635.pdf?index=trueIn PDF document text
    • https://421fb4ee-74d7-4aa9-a258-3f705df1d95e.filesusr.com/ugd/94e5ef_7cb748bf70a444c7a7a92223753d0a37.pdf?index=trueIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_33b9b5966aca4a3abacbe7da31f82475.pdf?index=trueIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_28d21e43f2264a1d9c7a6f1cea0dc1b6.pdf?index=trueIn PDF document text
    • http://jekidosokun.epizy.com/11101741428.pdfIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/fewuxebipujuxazes.pdfIn PDF document text
    • http://tafoboverel.epizy.com/biugo_app_apk_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/pivitotorapud.pdfIn PDF document text
    • http://febojuv.epizy.com/pizokifozego.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/kodelafubosulogo.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/what_to_do_if_your_ipod_nano_wont_turn_on.pdfIn 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_off000101cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 5440 bytes
SHA-256: 6d61aa15543a41c7df0e54b1fb4b6a444c7a32053046b5ad7a448237760327a4
font_01_sfnt_off0001146b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1146B 10412 bytes
SHA-256: 5c737f2a57ed561fb0ae5bf70686d34e6d9ab3101b59a299fb75ed1fcba30b7c