Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cf44659a105269…

MALICIOUS

PDF

91.7 KB Created: 2021-04-13 22:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 83097b06678cd415f635ef1e84f5b6a4 SHA-1: 9adf5a8ea9685c1bc0b354080051b709eb627ad7 SHA-256: 34cf44659a1052694fc95d6b328fc19b5edf6591b98249c5966beb667a2a2111
184 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics as a malicious PDF, specifically identifying links to known malicious redirector infrastructure. The embedded URLs and the PDF structure suggest an attempt to lure users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of malicious links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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/strik?utm_term=what+word+represents+the+letter+%2527t%2527+in+the+nato+phonetic+alphabet In PDF document text
    • http://fabofid.22web.org/27713322074.pdfIn PDF document text
    • http://ogranifruit.space/fipusbzoe5.pdfIn PDF document text
    • http://palejep.22web.org/the_wu-tang_clan_members.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451737/normal_606cba8614a39.pdfIn PDF document text
    • http://pubguckazan.com/49339240729lloa5.pdfIn PDF document text
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/fea2f694630503d.pdfIn PDF document text
    • http://reduslimer.website/455654118716hbru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410006/normal_600eaee8bca12.pdfIn PDF document text
    • http://digitalmedialit.com/80639150120clxv3.pdfIn PDF document text
    • https://fapizorimuko.weebly.com/uploads/1/3/1/1/131164308/mirovuvit-vafunexolexug.pdfIn PDF document text
    • http://4338bacchus.com/how_to_charge_a_g_shock_solar_watchiuonf.pdfIn PDF document text
    • http://idealica-italiaofficial.site/teretubanovopunedibami6ehf5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387918/normal_5ffdea0b8b7a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484114/normal_5ff2aeb969354.pdfIn PDF document text
    • http://lagajakazevo.22web.org/lovalakikozelu.pdfIn PDF document text
    • https://tebuzemuba.weebly.com/uploads/1/3/4/0/134042716/kuzigesawuweni_lojag_kanixaj_riforade.pdfIn PDF document text
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/af04a0132773f1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476924/normal_601bcffc73e33.pdfIn PDF document text
    • http://igrarazuma.info/dialysis_machine_for_saleejzc2.pdfIn PDF document text
    • https://neluposu.weebly.com/uploads/1/3/4/3/134369170/rejamemugokapanunu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lefamuredemupi.epizy.com/catholic_teaching_on_purgatory.pdfIn PDF document text
    • http://jabulimoj.rf.gd/cancer_stages_and_grades.pdfIn PDF document text
    • http://livagutavox.epizy.com/chakras_book_free.pdfIn PDF document text
    • http://fububosuvakosal.epizy.com/25686091443.pdfIn PDF document text
    • http://zimanozotowaf.epizy.com/mafimekub.pdfIn PDF document text
    • http://tinijev.epizy.com/kubikotoma.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_off00012726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12726 5440 bytes
SHA-256: 5f0e4f3089410fcd012a81c5452455361f1cc3cc0c6852e828efed0e787a711a
font_01_sfnt_off000139b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B8 11320 bytes
SHA-256: ea13ee7cab3eb376a8d9e9bbd7458481c60e1c2e9a9b9691f722ed08e6e08b4a