Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4a9bbe0b56c307…

MALICIOUS

PDF

83.6 KB Created: 2020-12-30 17:24:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7fdd948c0afcad2a6d2fb5d06c5d61bc SHA-1: eb172f9c4423cf40a734c0af97932878939e111b SHA-256: 7d4a9bbe0b56c3072bd00caf0f7797bcee140d4f0feba95952ec7ba2b72f1878
244 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, including a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'puzzle games'. The presence of a link farm and a malicious redirector indicates an attempt to lead the user to a compromised or malicious site, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

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
  • 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=connect+a+plug+puzzle+games In PDF document text
    • https://cdn-cms.f-static.net/uploads/4447487/normal_5fb8f4020c9b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465128/normal_5fca74ce3ad51.pdfIn PDF document text
    • https://dobopekajami.weebly.com/uploads/1/3/4/3/134314215/eb26a89f8d439be.pdfIn PDF document text
    • https://nimidakotogala.weebly.com/uploads/1/3/0/8/130874585/jajoridobireg-kijugenutivel-sasijoxumun.pdfIn PDF document text
    • https://titoduxelet.weebly.com/uploads/1/3/5/3/135399046/ee9dcc61b.pdfIn PDF document text
    • https://zewubonorow.weebly.com/uploads/1/3/1/3/131398185/5daf65d3005d74.pdfIn PDF document text
    • https://karujelibofab.weebly.com/uploads/1/3/1/4/131406149/zojetemowatonewova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387586/normal_5f9d5df8c580e.pdfIn PDF document text
    • https://lifitexuga.weebly.com/uploads/1/3/4/3/134356919/8277181.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/buxoparadazegu/zinajogujuziledofujorene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1d09a39-8228-477d-a3b7-9f96d7cef2e6/number_1_kitchen_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1726e015-cda0-41cc-b543-cceae2904e83/kivimatesujosemupiseluv.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_off00010ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 5112 bytes
SHA-256: b4c37c42c6a43d46343fc1e46e5580065b602350a1330d0979b8f2fbb12ac215
font_01_sfnt_off00011e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3C 10436 bytes
SHA-256: 3aa1fe27c18bad5337b964dfff93d7e740637ed0c0ebd1270dd9b0ba23116993

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