Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92a48e7ea737056…

MALICIOUS

PDF

72.7 KB Created: 2021-03-31 04:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8298c5cf51ac916f8c3648c847ea078d SHA-1: 5c6280e309ef3562144fd8d5d8e718321e20bb97 SHA-256: b92a48e7ea737056dec2623d9b6c4be03039ba2c5543607e4b7a4d17d6bbbe84
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded content, though partially obfuscated, appears to be related to search terms, further supporting the link farm hypothesis. The primary goal seems to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/strik?utm_term=lord+of+the+flies+pre+reading+activity+answers PDF link annotation
    • https://xetamoro.weebly.com/uploads/1/3/2/8/132815737/domenuzuzovifi-xewivijadugos.pdfIn PDF document text
    • http://vir-tus.com/answer_to_impossible_quiz_2_number_232o3o8.pdfIn PDF document text
    • http://butijimixuf.iblogger.org/htc_desire_eye_touch_and_display_price.pdfIn PDF document text
    • http://drovazvenigorod.ru/32721193250gruls.pdfIn PDF document text
    • http://it50discount.pro/catatonia_scalevt01i.pdfIn PDF document text
    • http://koreanluxe.com/google_maps_roads_api_android_examplemen4p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486060/normal_60497dedcd528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482853/normal_6048449dc571b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465392/normal_601e32ea3682d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493569/normal_60522b04384ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449788/normal_5fe71751c05dc.pdfIn PDF document text
    • https://vidujari.weebly.com/uploads/1/3/4/8/134858315/nutetokugomogusobun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471683/normal_600ce3e27a3aa.pdfIn PDF document text
    • http://mon-cmso.best/484527065568npoi.pdfIn PDF document text
    • http://confirmationhelpcenter.com/nirawosu9la5z.pdfIn PDF document text
    • http://kawlites.online/kixaxuxurazakunudevhojtp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470688/normal_602e3b0fef7bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390382/normal_6056735af2af5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416493/normal_600263b51e326.pdfIn PDF document text
    • http://siteznakomstv69.space/503573687603azcf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://berojopuzenon.rf.gd/72462859287.pdfIn PDF document text
    • http://gadoxijumulop.epizy.com/fikejifirozotosojakinop.pdfIn PDF document text
    • http://xobalemokalud.epizy.com/sunshine_adagio_in_d_minor.pdfIn PDF document text
    • http://guxovoxed.rf.gd/article_titles_in_apa_format.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_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 5612 bytes
SHA-256: 1dc0bafa12b41aeea93fa3dfa02dc0d02639e88e1b31a086e4c4012df039b074
font_01_sfnt_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 11124 bytes
SHA-256: e7655746dc01365608214003ed7a987f3a2ba2a6c9da123be0b54fa563504631