Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b08e6ea8791256…

MALICIOUS

PDF

101.9 KB Created: 2021-01-01 10:29:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d2131135d935487ee1a7d4ed8070f389 SHA-1: 975d370dd23c286748977baad4c025c72b45d5d1 SHA-256: 85b08e6ea8791256ffda41cffb1012d99a7542afe9a927163fdef8cf0c668b8d
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of links to external websites, many of which are hosted on disposable domains, suggesting a link farm or phishing campaign. The primary redirector URL, 'https://ggtraff.ru/strik?utm_term=latest+call+of+duty+for+pc', indicates a lure related to a popular game to entice users to click. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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://ggtraff.ru/strik?utm_term=latest+call+of+duty+for+pc In PDF document text
    • https://pufizemopuvagup.weebly.com/uploads/1/3/1/4/131407511/2049531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426418/normal_5fa7d84e6d309.pdfIn PDF document text
    • https://lejoxenususoja.weebly.com/uploads/1/3/4/4/134497781/8424285.pdfIn PDF document text
    • https://wixotavu.weebly.com/uploads/1/3/4/7/134764887/gajesat-xikujinum.pdfIn PDF document text
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/mefekakab.pdfIn PDF document text
    • https://mufixedak.weebly.com/uploads/1/3/4/6/134602267/zezimuxel.pdfIn PDF document text
    • https://wajifisawebe.weebly.com/uploads/1/3/4/4/134480175/zezew-sarogif-daroj.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/vevotizelofi.pdfIn PDF document text
    • https://seriraradekabas.weebly.com/uploads/1/3/4/0/134016679/de11574.pdfIn PDF document text
    • https://pimupaxepa.weebly.com/uploads/1/3/1/8/131857198/gudasuwatozad_gosuxezapobes_dujaguke.pdfIn PDF document text
    • https://dukiferuxol.weebly.com/uploads/1/3/0/8/130873869/miporibik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c27225f-2f01-4935-baa1-97c4a56f1bdf/84515233851.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/excel_form_control_vs_activex_control.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_off00015014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15014 5192 bytes
SHA-256: 16ffed954fd1882b9eeca592913a546e05b2f6cb30ceffe783e33549df199e36
font_01_sfnt_off000161dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161DD 12804 bytes
SHA-256: 26058b1f8142beb06d014d8c8cf4a625d1896ef8d48595f1bfe27298ff883d42

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