Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b7204e1e9e5997…

MALICIOUS

PDF

78.1 KB Created: 2021-03-03 03:57:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: e31696f567ccf9a3bea2ea731f8fe173 SHA-1: d797382e2becff9c6c34a72b5e3b46c1d8cbb5bb SHA-256: c4b7204e1e9e599772c38d64ad22adca0ca2cdee977a686d0b683f4fedd78ab2
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, and one prominent URL that appears to be a lure for a search query. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=how+much+is+michael+jackson+signature+worth PDF link annotation
    • http://gudelew.mywebcommunity.org/wukogewobivavipoperi.pdfIn PDF document text
    • http://kinemulawaw.sportsontheweb.net/what_are_the_three_appeals_in_writing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_602c677d6a208.pdfIn PDF document text
    • http://ryukzak.digital/ray_dalio_economic_principlesu84d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501360/normal_5fecf07bd30b4.pdfIn PDF document text
    • http://zarewubizeno.mywebcommunity.org/titivotuvefalig.pdfIn PDF document text
    • http://homearfes.com/zedelilodewewexigatazozaxrnph.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/26409135993.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/is_amazon_making_a_lord_of_the_rings_series.pdfIn PDF document text
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/kufujixodi.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/62790047832.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/west_bend_bread_machine_recipe.pdfIn PDF document text
    • http://fridgeservice.ru/yamaha_mg_166_cx_service_manual6ufk7.pdfIn PDF document text
    • http://trikolor.site/7771823340j1o1y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/bull_snake_care_guide.pdfIn PDF document text
    • http://naxesabefadufu.atwebpages.com/davunoxavapelupis.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/hospital_acquired_pneumonia_guidelines_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/95091417336.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_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 5404 bytes
SHA-256: bc872cb598e41eaf4531115eb463f5031a57d155fa5e06e0a7832d201ac5c376
font_01_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 11552 bytes
SHA-256: 2fe43ba8df2d135a1384975a03ee6eac2984d1289fc5d4f8f7a35171d414142f

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