Malicious PDF — malware analysis report

Static analysis result for SHA-256 9663a9e853524622…

MALICIOUS

PDF

75.0 KB Created: 2020-12-26 11:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fa54f2348b6562a36a8e82507081f25f SHA-1: e28a26aed305e038a334ef690b0caddcc0da2d5d SHA-256: 9663a9e853524622c7b633cdef5abd449998a1ac60e06ec180f5dde1cfe58bbb
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded links. Several heuristics indicate it functions as a link farm, with many links pointing to disposable hosting services and a redirector. The primary purpose appears to be directing users to external content, potentially for SEO manipulation or to serve as a lure for phishing or malware distribution.

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=nfl+top+100+all+time+team+running+backs In PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/kovolobox.pdfIn PDF document text
    • https://vidafipi.weebly.com/uploads/1/3/1/6/131636743/jileneropaze_debefut.pdfIn PDF document text
    • https://kozowesojufeg.weebly.com/uploads/1/3/4/7/134717080/5114244.pdfIn PDF document text
    • https://siwusoxol.weebly.com/uploads/1/3/4/5/134584737/eb45ac6cfd05f4.pdfIn PDF document text
    • https://bisawovetazevel.weebly.com/uploads/1/3/4/6/134613631/6380339.pdfIn PDF document text
    • https://vizodifoberesin.weebly.com/uploads/1/3/4/9/134900429/6666682.pdfIn PDF document text
    • https://duvugegigoga.weebly.com/uploads/1/3/1/4/131409055/4967a878bc.pdfIn PDF document text
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/rubil_lizobobunopefif.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/oibghGH/55651877302.pdfIn PDF document text
    • https://cdn.sqhk.co/totuzilexif/NgfLicC/myhousing_portal_uc_davis.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/vabemavuputenif/braille_alphabet_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/58165897467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e490305b-5d70-43f7-ae57-f47ada76720f/best_books_on_audible_romance_package.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df783050-fbf0-4b12-8715-7e0dab1095c8/wdve_morning_show_podcast.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/chunking_division_worksheets_year_6.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_off0000e880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 5700 bytes
SHA-256: 739edf4532a0cc3db9174e7a22273e63afcf891add27635fdb1de4945d4337b5
font_01_sfnt_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 10468 bytes
SHA-256: be98699249303442a169d3fdc8e7ffa94056bf4b661e4db61c7e183b7d8e6357

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