Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3391181919b5aa2…

MALICIOUS

PDF

125.9 KB Created: 2021-03-23 05:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: fd923578901cbf3d833e0ecd048a3b99 SHA-1: 5507539da774b74a3b10a566d97021d22ceb4b86 SHA-256: b3391181919b5aa27a9afefa1ffb2f21ffa5cef6660cd71aa74d4c896108f670
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and Weebly-hosted files, suggesting a link farm or SEO abuse tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://midufefew.ru/wix?keyword=giraffe+incubator+carestation+service+manual PDF link annotation
    • https://jetorijeroxu.weebly.com/uploads/1/3/4/6/134693882/8693223.pdfIn PDF document text
    • https://tanibabinilez.weebly.com/uploads/1/3/4/0/134018029/fugebufedivo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454543/normal_5ffbd2fadf8f9.pdfIn PDF document text
    • https://nowuvufeguxebib.weebly.com/uploads/1/3/2/8/132814980/33dcd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392871/normal_60325753b2434.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/dark_souls_2_design_works_review.pdfIn PDF document text
    • http://pusatokolerax.mywebcommunity.org/53214010730.pdfIn PDF document text
    • https://mexobuvuxe.weebly.com/uploads/1/3/4/3/134369937/2161595.pdfIn PDF document text
    • https://judumufef.weebly.com/uploads/1/3/0/7/130738812/bofuwuve_vumebigarubimuw.pdfIn PDF document text
    • https://vuzupugum.weebly.com/uploads/1/3/1/4/131453250/fikosatetiwakewa.pdfIn PDF document text
    • https://pedasivu.weebly.com/uploads/1/3/5/3/135387907/vulixixikoturisaz.pdfIn PDF document text
    • https://wavopotajulaja.weebly.com/uploads/1/3/4/6/134631105/678d000b1.pdfIn PDF document text
    • https://ripabukufekova.weebly.com/uploads/1/3/0/7/130738984/sekipetek-kuronabezori-taveduded-ludaxef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392463/normal_5ff0046bbd524.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423154/normal_5fef8f81294c8.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/tisegovofu/tom_and_jerry_cartoon_song_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/suvovafenavo.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/doreen_massey_space_place_and_gender_summary.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13328 36856 bytes
SHA-256: 7e4f64c6bcb2a1ee3f3c7d9d143ffbae30d142d24ab2cba3a0cab32eca58c802
font_01_sfnt_off0001a459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A459 5256 bytes
SHA-256: 4045cc87036a75afeb4d4af68473e00edb450f2a85dca71009cd92e2fc3d5c43
font_02_sfnt_off0001b633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B633 18616 bytes
SHA-256: 2676e8a5f73fe779ce25a255c82cfd7c231ebd11a716b72dd72cbb23bf557525

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