Malicious PDF — malware analysis report

Static analysis result for SHA-256 381532d4ec6867a5…

MALICIOUS

PDF

77.0 KB Created: 2021-03-16 02:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e1d0b811625414f0037ae93c03dbee51 SHA-1: ae9790c93940efeb212236aff20d41cb737406ba SHA-256: 381532d4ec6867a5f47cf84aebc37459a3fde3c013cbb1046e48ad0a4c407d38
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many of which appear to be part of an SEO link farm designed to redirect users. The primary redirector URL is https://druttle.ru/strik?utm_term=what+degree+do+you+need+for+veterinary+assistant, which is likely used for phishing or to serve a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/strik?utm_term=what+degree+do+you+need+for+veterinary+assistant PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421612/normal_5fd22193c2f8e.pdfIn PDF document text
    • https://wojodusu.weebly.com/uploads/1/3/2/8/132815854/8510976.pdfIn PDF document text
    • https://zomanuvid.weebly.com/uploads/1/3/4/4/134477829/lewagag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368251/normal_60250d10db3cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475000/normal_6009dae9363a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387406/normal_60337a03ce82d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419826/normal_5fc7632ba8a61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420238/normal_5fdef297ae2f1.pdfIn PDF document text
    • https://paxogusav.weebly.com/uploads/1/3/4/0/134040839/4d03e67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445343/normal_5fffbd3293ade.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/50cbef7c-ed64-4d50-bd45-9b4e2315d869/why_do_my_back_speakers_not_work.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/12510964770.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/best_website_to_paid_android_games.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/kezososuzomedone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dfb3dd9-0a5b-46ce-af65-b97d336e286b/46954637973.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/java_string_format_fill_0.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/example_of_classroom_behavior_management_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/rorexufubes.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_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 5312 bytes
SHA-256: d3d6c129548ded5f2e3a49b9b45a3e245e8ecc1bee1645669dbc0c1f901b1a82
font_01_sfnt_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 10692 bytes
SHA-256: b14deb3852ccbccbaea9224743d2922aed643057ed89b019974a8500737f3062

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