Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23a74727dde255e…

MALICIOUS

PDF

76.5 KB Created: 2021-03-24 20:15:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8f060c6ebf12b46c8a712bb89f13757 SHA-1: 79e1b331d5866758eed06c90c5466e1558bf1a0b SHA-256: e23a74727dde255e7ffc1e3b0a77465ae09eacc8a744e92385eda5f62134f072
186 Risk Score

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 domains, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites, potentially for malware delivery or credential harvesting.

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://jumiwimov.ru/strik?utm_term=feudalism+lesson+plan+high+school
    • http://sollabs.xyz/hp_50g_price6f51u.pdf
    • https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/jelowonabijidose.pdf
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/2904605.pdf
    • https://fitelibisubun.weebly.com/uploads/1/3/3/9/133987071/mifis.pdf
    • http://begdas.fun/603712528597sgkg.pdf
    • http://sandiego-podcasts.com/coachmen_beyond_specsd6r7d.pdf
    • https://cdn-cms.f-static.net/uploads/4420470/normal_5fe91e6937423.pdf
    • http://lamisorosasam.mywebcommunity.org/linksys_ea6500_v2_openwrt.pdf
    • https://zodoxofavuzawa.weebly.com/uploads/1/3/1/4/131437464/ginasu.pdf
    • http://gejesixave.scienceontheweb.net/aprender_a_tocar_guitarra_acustica.pdf
    • http://goromeo.club/xevakuwogeaw5sb.pdf
    • http://xiwupulo.medianewsonline.com/prepositions_of_time_and_place_exercises_with_answers.pdf
    • https://cdn-cms.f-static.net/uploads/4468828/normal_6058884a4536f.pdf
    • http://lnstagram-helping-centre.com/94184957483co0f9.pdf
    • https://kowexemi.weebly.com/uploads/1/3/1/8/131872048/2075962.pdf
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/jozalerodatakarof.pdf
    • https://jetireduru.weebly.com/uploads/1/3/1/4/131453335/1299832.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fotizojorirepel.onlinewebshop.net/degradacin_de_los_suelos.pdf
    • http://gegilifopom.myartsonline.com/pokojexoxakibapinijilito.pdf
    • 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_off0000ed65.bin
2dc0b9f04141786aabca51bc393b46e94dfeb2abe158b91df942673759070d88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED65 5344 bytes
font_01_sfnt_off0000ff74.bin
6cac0a8cfb62e6a49635f33b421edb219cc47312d420758efcb0e72b74889ec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF74 10964 bytes

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