Malicious PDF — malware analysis report

Static analysis result for SHA-256 50451cec488554de…

MALICIOUS

PDF

88.1 KB Created: 2021-05-18 11:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 638e1da4e30c4288698f512c0dd963f1 SHA-1: 70f0c26d7e5457d69548bba4125629c1dfe21986 SHA-256: 50451cec488554de911c9e1ac5086720a300a199fd9ba08bde68ac1f313d5c0b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URL 'https://leonvi.ru/strik?utm_term=how+to+get+geometry+dash+for+free+on+pc' is part of the lure, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://leonvi.ru/strik?utm_term=how+to+get+geometry+dash+for+free+on+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403540/normal_600eba5178435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_5fd5f77eda8a8.pdfIn PDF document text
    • https://wifitesoxu.weebly.com/uploads/1/3/4/6/134631177/dipigemeradeno-puxejubek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490936/normal_601332c563d7c.pdfIn PDF document text
    • https://guxulixekakuved.weebly.com/uploads/1/3/5/2/135294256/paxaxukodusisok_miligufuwoz_domimawumexitew_sixuxigadiwel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460233/normal_604cf70a5ed27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500889/normal_602a27c21d57f.pdfIn PDF document text
    • http://popuboloza.22web.org/funny_cartoon_videos_free_for_whatsapp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475376/normal_5fe5bfd8f0831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419003/normal_5fd95c3f58574.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461232/normal_5ffc34ff58835.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485718/normal_606a09607ad63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449789/normal_5ff16c62dc2fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fevewit.epizy.com/easl_guidelines_2018_hepatitis_e.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/10486987606.pdfIn PDF document text
    • http://nisifibuvez.epizy.com/10th_class_maths_solution_tiwari.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/86541296978.pdfIn PDF document text
    • http://duvubatas.rf.gd/33803819868.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_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 5692 bytes
SHA-256: fd42d73863d260ff2948502db13c779e5af7370c6097f84df894b4a1f586d3fd
font_01_sfnt_off00012c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C52 11336 bytes
SHA-256: 4c1d56acea8802e4b89a9d0b391c9678bb3a173f35858256fa25ab658d4e4e11

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