Malicious PDF — malware analysis report

Static analysis result for SHA-256 efafde650895c208…

MALICIOUS

PDF

75.8 KB Created: 2021-04-14 22:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e070166d687ff3ebc26a642c0ed6d176 SHA-1: eed9f8ec6033df6cf0a0c5bfe019c9205de89060 SHA-256: efafde650895c208be73bdc3f675e6c7e1eaced41a9b2d4d0d6972fa66fd719a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. One of the primary URLs, 'https://dafemum.ru/strik?utm_term=what+does+second+order+mean+in+chemistry', appears to be a lure for users searching for chemistry-related topics, likely leading to a phishing page or malware download. No scripts were extracted, but the PDF structure itself facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://dafemum.ru/strik?utm_term=what+does+second+order+mean+in+chemistry
    • https://static.s123-cdn-static.com/uploads/4450631/normal_5fcff4d16352b.pdf
    • https://vibakifekapob.weebly.com/uploads/1/3/1/3/131398015/c2574e2d.pdf
    • https://gomibabojusul.weebly.com/uploads/1/3/1/4/131483197/8916429.pdf
    • https://dadekubezaxinis.weebly.com/uploads/1/3/2/7/132740399/249917.pdf
    • https://febelozo.weebly.com/uploads/1/3/4/5/134599394/zagapuka-woleved-gilorojanexo-tepag.pdf
    • https://zojevobe.weebly.com/uploads/1/3/1/1/131163992/tukedupale.pdf
    • https://cdn-cms.f-static.net/uploads/4380072/normal_60661200cbe5b.pdf
    • https://static.s123-cdn-static.com/uploads/4463532/normal_5fe3aca4af0e1.pdf
    • https://nafizanoride.weebly.com/uploads/1/3/4/5/134596231/d42ff.pdf
    • https://biwimukapol.weebly.com/uploads/1/3/1/3/131398517/c83ca89d48.pdf
    • https://sawolopu.weebly.com/uploads/1/3/6/0/136049845/7944546.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_d733cc2f4c8f4e9c87645f106fe28394.pdf?index=true
    • https://uploads.strikinglycdn.com/files/772b25ce-4253-476c-9bed-a31f9048f80f/comprension_de_lectura_continuidad_de_los_parques.pdf
    • https://926da24b-d3df-4aea-ac1b-ebdf7359a9e7.filesusr.com/ugd/fef925_911418f1ac6345619f968dfb5050925a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/be7298a3-a5cd-4ef9-93f3-fe9ffa5e05a6/2231717400.pdf
    • https://uploads.strikinglycdn.com/files/27a0e7a5-c53b-4b3b-83af-53c4b8952413/wekusumabokofanotejuku.pdf
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_77f6226b72514ea8b3754a318eb44134.pdf?index=true
    • http://vozepagejesegi.epizy.com/sozosode.pdf
    • http://pejonoma.epizy.com/nisakisu.pdf
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_639be0d80d9b4012abc34d4821655e04.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b2.bin
7dfc70ac3cfceb6c3ff28b8afe3961e2953e9a726b8e65a054a86e0b828368a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 5264 bytes
font_01_sfnt_off0000fb7d.bin
faed6c30165144d05f65799c2df7fa9b5b41c15a80a51c8b8506e6c8afe3e2a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 11032 bytes

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