Malicious PDF — malware analysis report

Static analysis result for SHA-256 457dbf355a9a6c46…

MALICIOUS

PDF

70.8 KB Created: 2021-01-03 13:57:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 065cab684fdf3ff16001859cf94ca606 SHA-1: eb74b56029fcde9896b78f8803bd9930871cb5d7 SHA-256: 457dbf355a9a6c464986f9ca99f68ca3c6105221464d98a961a32114b7fbbd3c
252 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 links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirector workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/aws?utm_term=usb+modem+application+android In PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/vevigikokilibar_pavewun_fubija_waduf.pdfIn PDF document text
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/vaseke_razelibibaloniv_fifojajuselu.pdfIn PDF document text
    • https://setopotuvojinow.weebly.com/uploads/1/3/4/8/134877086/9546008.pdfIn PDF document text
    • https://rilebowiteb.weebly.com/uploads/1/3/3/9/133986594/f16320b962c2ce.pdfIn PDF document text
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/0a2c83eea198.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/Gies9Wk/lufafulizigojikok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388420/normal_5f9819a3e9fca.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/b4373144-7014-4f79-80fa-d381c515ab52/dnd_5e_weapon_prices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1def498-4a4e-41cf-8b7a-d41f7c159c6f/dragon_god_of_war_fight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a267321b-b46e-45a3-a76a-aa7cd30eb349/sezovebevisujutenemasulep.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/musinerebebibowozesif.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_off0000cda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA3 5348 bytes
SHA-256: 138bbd4c93d51df89c286acd7e2da4743ec297bba54145ac7bd996e8a8fabcfa
font_01_sfnt_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 17652 bytes
SHA-256: 72aaacb8e3085fa34e596ea2fcdb41e8e1fda7da4330edce17cb819c94c405df

Open this report in the interactive analyzer, or submit your own file for analysis.