Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d5a7f6f1b68148…

MALICIOUS

PDF

80.1 KB Created: 2021-05-03 08:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 538f758ea146f1d726c0a20e2116d443 SHA-1: 99599814a920268ec780bca8ad318ba19e216624 SHA-256: 51d5a7f6f1b681481f97e44ef110627c16654d9646f40f258ef535953399214e
194 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic to potentially malicious sites. The presence of a 'download button' heuristic further supports the idea that the document is intended to trick users into clicking these links. ClamAV detection as 'Pdf.Phishing.Trojan' indicates a high likelihood of malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/strik?utm_term=age+of+empires+1+gold+edition+no+cd+crack PDF link annotation
    • http://odemebayisitrafik.com/368237709298dx1x.pdfIn PDF document text
    • http://swiss-gear.shop/how_to_reset_samsung_fridge_freezer_displayugyw1.pdfIn PDF document text
    • https://lekemevegov.weebly.com/uploads/1/3/1/4/131410090/43e9e883186fb.pdfIn PDF document text
    • https://xanosetad.weebly.com/uploads/1/3/1/1/131163691/6923071.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_602dccdd9469e.pdfIn PDF document text
    • http://robinmani.site/income_guidelines_for_food_stamps_in_nczjbnz.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/i_hate_u_give.pdfIn PDF document text
    • https://wefojomoki.weebly.com/uploads/1/3/5/3/135389947/07ed4ed.pdfIn PDF document text
    • https://makigomeludawuk.weebly.com/uploads/1/3/4/7/134748455/funuwaxi_najari_wujewu_rotokariba.pdfIn PDF document text
    • http://xofofumireke.mypressonline.com/fulukigokipija.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/rational_choice_theory_examples.pdfIn PDF document text
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/6554912.pdfIn PDF document text
    • https://xaziribubeka.weebly.com/uploads/1/3/4/3/134397614/599031.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423145/normal_605a6e79b2ade.pdfIn PDF document text
    • https://tolixolosunep.weebly.com/uploads/1/3/4/4/134403343/4020200.pdfIn PDF document text
    • http://fullhp.info/what_is_literature_review_in_research_proposalyp504.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370054/normal_5fc744c85fc6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_a20085645fa046a5ac88fab90e9b0a20.pdf?index=trueIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_d0547794a55f453ea9d91aca18937d0f.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_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 5580 bytes
SHA-256: 45f3373bbf2f163588a6c45e66c7c23f4b33a7d8abb4a5027944ab4c83dc19a1
font_01_sfnt_off00010c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0D 11260 bytes
SHA-256: 40e05a235f240c8042970f855437572a8f7fb459892110c1717d0e83c205597d