Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8424844d427579…

MALICIOUS

PDF

83.0 KB Created: 2021-06-08 01:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 790e6959c4ed226938a567e2e4ed586c SHA-1: 3c46afbef60770cee659f0e2b37f24e84f553a17 SHA-256: eb8424844d427579513ee2603cecf85dfc2f4a4225bb470b02fc28c05cd9c257
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/123?utm_term=best+android+phones+under+20000+in+nigeria In PDF document text
    • https://cdn-cms.f-static.net/uploads/4449193/normal_605a611fc2abd.pdfIn PDF document text
    • https://kipuzavudikonog.weebly.com/uploads/1/3/4/6/134685368/fogizilivanusebub.pdfIn PDF document text
    • https://jijuvujoxepika.weebly.com/uploads/1/3/4/7/134740737/perozufulak-fovefudimisodab.pdfIn PDF document text
    • https://kamejufozafa.weebly.com/uploads/1/3/4/8/134891268/8790780.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/luzurubotugobun-puzitobimazaji.pdfIn PDF document text
    • https://nitavadokeja.weebly.com/uploads/1/3/1/1/131163909/2703714.pdfIn PDF document text
    • https://tufajunij.weebly.com/uploads/1/3/2/6/132695836/juzetukumuken.pdfIn PDF document text
    • https://tadiseregofinu.weebly.com/uploads/1/3/4/7/134748358/9454780.pdfIn PDF document text
    • https://surugatolezijef.weebly.com/uploads/1/3/4/6/134631687/82377d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456389/normal_5fcb922d19a37.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391907/normal_5ffc8e1b4b376.pdfIn PDF document text
    • https://wapoduleg.weebly.com/uploads/1/3/4/8/134882123/d9c0785.pdfIn PDF document text
    • https://somukenevibo.weebly.com/uploads/1/3/4/5/134525583/755d420ea13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_604a182475476.pdfIn PDF document text
    • https://pepodefaposuv.weebly.com/uploads/1/3/5/9/135992330/zinolakesexoga.pdfIn PDF document text
    • https://xasibegofijuga.weebly.com/uploads/1/3/4/7/134731363/8233a8651dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_605b61c71f254.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4424647/normal_60afeec7e768c.pdfIn PDF document text
    • https://tujobofawoti.weebly.com/uploads/1/3/2/6/132695409/4391980.pdfIn PDF document text
    • https://zesefoposijun.weebly.com/uploads/1/3/4/6/134672262/wurezuz-nomilateguxezul-godusuwolerivi-busuti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448331/normal_603cc1d1d3de2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off0001047e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047E 5512 bytes
SHA-256: de71131ae779e6d7cffa01871bb3dd27df085d100eb8a2d2325f28d9f740e886
font_02_sfnt_off00011736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11736 11436 bytes
SHA-256: b2768a1fae730f669e2186aff40c969f5fa0d86e0e9ac0389476465b1cefd281