Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1e4e8e773224d0…

MALICIOUS

PDF

109.4 KB Created: 2021-03-14 13:19:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ef7f8c90cb5199e4507e36ac4ab35fb6 SHA-1: 698885e8b3f97c3f6bfad240dd81375784d6b488 SHA-256: 8f1e4e8e773224d067253f059d964d4052f959be5b0d28b02de8a006ea4c07eb
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and potentially malicious redirectors, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristics. The ML classifier and ClamAV detection further support its malicious nature. The primary function appears to be directing users to external, potentially harmful content, rather than containing a direct payload within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=hatsune+miku+project+diva+f+trophy+guide+vita In PDF document text
    • https://cdn.sqhk.co/liregevo/Xhbjggc/history_of_russia_book.pdfIn PDF document text
    • https://romudakon.weebly.com/uploads/1/3/5/3/135318284/7492202.pdfIn PDF document text
    • http://csxmoney.info/kabozuwurupegaritubexamexlqyvb.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/Z5ijYAU/fagavorubuzupuge.pdfIn PDF document text
    • http://shopyou.online/grammar_english_fullx1fc3.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/8883429.pdfIn PDF document text
    • https://lurusinobafor.weebly.com/uploads/1/3/2/7/132710654/8425d.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/yhgKsjc/vurubem.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/hhahaKU/simple_fall_card_ideas_free.pdfIn PDF document text
    • https://cdn.sqhk.co/texirova/5QNhhhd/73361374781.pdfIn PDF document text
    • http://thestablestl.com/sql_injection_owasp_cheat_sheetz4d8w.pdfIn PDF document text
    • http://stankoff.org/68057472987r8xvb.pdfIn PDF document text
    • https://fusufuxono.weebly.com/uploads/1/3/1/6/131606103/gesijes-sotaxarusul-duwat-giborus.pdfIn PDF document text
    • https://kobadibik.weebly.com/uploads/1/3/4/8/134861151/26294811.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/lGHgcBW/aimpoint_micro_t2_weight.pdfIn PDF document text
    • https://cdn.sqhk.co/jerivudofin/jjyxGjg/mobile_payment_companies.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/KijmZmR/ww2_plane_quizzes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_f27fd83bd81f45889c80a989d560de29.pdf?index=trueIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_13f8e5454a974b1d911183971a212f72.pdf?index=trueIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_f73714aede16463cae1373e078341ff8.pdf?index=trueIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_d38bf1d8b17040bc97409a5a6f7af9ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/cuanto_mide_un_bebe_de_1_ao_y_4_meses.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/videnijufojoxovod.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_off0001670a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1670A 5800 bytes
SHA-256: b04585eed53e2c0b3eae982848cd880fbb5a329c51440011a77c79d9f0bfa990
font_01_sfnt_off00017abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ABB 12736 bytes
SHA-256: b251bddb6682cd8f74093572c19436252b0b00217a6219a82d95129b55886f4c

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