Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2733632551d5e6…

MALICIOUS

PDF

69.1 KB Created: 2021-04-08 05:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b43917973989c89062079b7db52a6542 SHA-1: 57637987c98d3908520cd27e19d3e79ce47e2832 SHA-256: 8b2733632551d5e6123da4e96a132231cef5ab9572084b727b1de910e7f7948f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other file-hosting services, suggesting a link farm or a distribution mechanism for further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://botokaw.ru/123?utm_term=chiari+malformation+awareness+t+shirts
    • https://wumikedamuzu.weebly.com/uploads/1/3/4/3/134324885/sopamimefixevo-fudalifisoja-zamemozuv.pdf
    • https://tusuwijajibu.weebly.com/uploads/1/3/4/5/134517525/vejovu.pdf
    • http://nesobaka9.xyz/what_were_the_goals_and_actions_of_the_jacobins8odd1.pdf
    • http://xovitixekewelom.scienceontheweb.net/ideology_and_ideological_state_apparatuses_essay.pdf
    • http://richteam.site/jedalonidiriluxeyt30b.pdf
    • http://goromeo.club/bofodapovoxagipona07z.pdf
    • http://kofupum.mygamesonline.org/hotpoint_gas_oven_broiler_not_working.pdf
    • https://regutipedazuvi.weebly.com/uploads/1/3/1/0/131071249/vagide_muxebesikijo_wofosimuzegul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_9cc8687f64d5402db97ca0d0e6e8be48.pdf?index=true
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_c32c559241a643a6a6ebed52196afb67.pdf?index=true
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_d9964841877745ac92a00b4513fbc4b0.pdf?index=true
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_9413516fab7444eb9ea14ddb4f11d92c.pdf?index=true
    • https://781b76d0-895c-4d4e-90f3-491762fad171.filesusr.com/ugd/894952_13d31ba915964c5b82a05f290422b9e9.pdf?index=true
    • https://s3.amazonaws.com/xapijifas/7028165019.pdf
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_5dffc158274f4cee892eb91116e13c86.pdf?index=true
    • https://s3.amazonaws.com/xomepixo/game_of_thrones_sheet_music_easy.pdf
    • https://s3.amazonaws.com/faxaxos/taverarivonibiba.pdf
    • https://s3.amazonaws.com/zusevamasor/nora_roberts_of_blood_and_bone_characters.pdf
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_b35596c2fe724782bc7e2324a1e9d2aa.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_off0000ce11.bin
02f418f57fcedf1c13d1334b79d6a17784056a964aada5ae6f14afef886a86d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE11 5004 bytes
font_01_sfnt_off0000def5.bin
9f7bb1ff03c81099f5dbac04b7b3bb8a8dff308024405ab686ed2be708e8525a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF5 11876 bytes

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