Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d771cd785d0767…

MALICIOUS

PDF

61.4 KB Created: 2021-02-23 12:12:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 3acda61029ee051b99e84a4d6ba0dec5 SHA-1: d01cb684ead12c96f2e46c10766ea02e97db42ba SHA-256: a7d771cd785d07673b529d346617351461758135f09eacc56b3dfac93cbd2a3d
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crophysi.ru/wix?keyword=regents+biology+lab+graphing+answer+key In PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/pupejijexukaxuji.pdfIn PDF document text
    • https://sutapupimode.weebly.com/uploads/1/3/4/6/134615637/pizerebusate.pdfIn PDF document text
    • https://silagonamep.weebly.com/uploads/1/3/1/4/131452845/suves.pdfIn PDF document text
    • https://wapexuji.weebly.com/uploads/1/3/5/3/135329723/fbf2431c7d722.pdfIn PDF document text
    • https://kuwiliwal.weebly.com/uploads/1/3/1/3/131378779/kupuvirumojiwu.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/devifekegenugiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411931/normal_60256e8dbda8c.pdfIn PDF document text
    • https://gutoserenenew.weebly.com/uploads/1/3/2/6/132681448/ruralenalix_paxesabuw_wemimenunususa_juboto.pdfIn PDF document text
    • https://jetosopotow.weebly.com/uploads/1/3/4/0/134018613/gobapewotipe.pdfIn PDF document text
    • https://bexulijariva.weebly.com/uploads/1/3/4/8/134885506/3399411.pdfIn PDF document text
    • https://bozadabeduli.weebly.com/uploads/1/3/4/8/134869561/4927248.pdfIn PDF document text
    • https://navuvosukogeguf.weebly.com/uploads/1/3/1/4/131454151/ef9aae6b.pdfIn PDF document text
    • https://lobalose.weebly.com/uploads/1/3/6/0/136089755/diguvorawetarega.pdfIn PDF document text
    • https://simujuzejopu.weebly.com/uploads/1/3/5/3/135305424/puvanejugunu.pdfIn PDF document text
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/lukinanefefim-tidugeba-zamip-penewevimumemaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000b590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB590 5484 bytes
SHA-256: d457522fca0f633d341cf2eb2bea32a7863e30ed7d482fab1ab022f9803c50e9
font_01_sfnt_off0000c850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC850 9432 bytes
SHA-256: 499cc254927547e01f17635ffc2d73dee473a1056684cd804c227b63b824b076

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