Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9aaccce3116b43…

MALICIOUS

PDF

70.1 KB Created: 2020-11-24 02:37:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cea263925cfe9643e2eeb2e51aef584b SHA-1: d75a245d15da772258c82da6a86b58f281cadbc3 SHA-256: 8f9aaccce3116b43ac35591aa7d26878a13afd1e547c6624ea7e5ea2fbaaeff6
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites.

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://gettraff.ru/strik?utm_term=subnautica+krebs+bohrarm In PDF document text
    • https://jejaxome.weebly.com/uploads/1/3/4/4/134443668/zajemit-mimefupigu-zejusolade-vanobotodase.pdfIn PDF document text
    • https://bavibexovapow.weebly.com/uploads/1/3/4/6/134643610/jetiwidetimawufegaka.pdfIn PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/jigam.pdfIn PDF document text
    • https://zilakakazaxo.weebly.com/uploads/1/3/4/4/134442972/4217722.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/lupevor-fonitusirivom-boxep.pdfIn PDF document text
    • https://bizidijekivaza.weebly.com/uploads/1/3/4/5/134502856/e130da2f6f40648.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/nazekisigiduz/electric_pasta_machine_marcato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdb10fe7-f9b1-4e16-b663-419b6f5d26d3/alpine_cde_172bt_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef675ca-dd0f-4244-83bc-a67497305c2a/febesivarupadojalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b63cfb-6c0e-448a-b997-cea810c10c92/dimefejuwosutesexuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2aef352-8030-4e73-8e78-3160eabc27d1/vodamubenaxuxafetom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f349d67-4b3f-4f2e-921e-22c411f46247/65826674050.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46e3e6be-15e6-4ed0-8576-3d9bc8a532ca/rodijeranebugap.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_off0000d3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E7 5316 bytes
SHA-256: 6e57c824d9dc0eac58d518bd3e56af87e2f21e1bc2a966c45b0708a64ab9fb47
font_01_sfnt_off0000e5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 12004 bytes
SHA-256: 3cf6a4521f97c5fbfcee93ee16cf808cf4b7c9d9817ce2bf3377fe7d5b448aee

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