Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b523651439d3a2e…

MALICIOUS

PDF

77.3 KB Created: 2021-03-22 02:25:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10cb587cedfc14599d95ffd450055a1d SHA-1: bfa5095e5e04afeaa886ce8a85846bd3f3e2534e SHA-256: 4b523651439d3a2e97ef9ebcd37328009dd24cbc1732d4c9155f925566b9cc95
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to manipulate search results or distribute further malicious content. ClamAV detection and ML classification strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. While no scripts were directly extracted, the PDF structure and link farm heuristic point towards a malicious document designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://gotiwokina.iblogger.org/48265365870.pdf
    • https://cdn.sqhk.co/tisufupujeli/hagepib/femetonekezipos.pdf
    • https://cdn-cms.f-static.net/uploads/4480399/normal_601717c7f1d28.pdf
    • https://cdn.sqhk.co/rupizabiweze/5Vifjat/bengal_tiger_video_songs_com.pdf
    • http://vojemodipu.sportsontheweb.net/identifying_phases_of_the_moon_answer_key.pdf
    • https://cdn.sqhk.co/puruwedisuma/hNgHAgj/pitapuzaw.pdf
    • https://cdn-cms.f-static.net/uploads/4371508/normal_60163b66da5a5.pdf
    • https://cdn.sqhk.co/vujejanar/CDibgio/95329005019.pdf
    • http://fipizilemuwob.medianewsonline.com/how_to_treat_gum_pockets_naturally.pdf
    • https://cdn.sqhk.co/zubuwebofe/cnjaTVI/vovowo.pdf
    • https://cdn.sqhk.co/xorazasuno/JjeZgih/98708734754.pdf
    • https://cdn.sqhk.co/fujotojaxob/ieYIiiK/dragon_quest_builders_3_star_dormitory.pdf
    • https://cdn.sqhk.co/metusoteliza/yCJIljc/retroarch_xbox_one_tutorial.pdf
    • https://cdn-cms.f-static.net/uploads/4495262/normal_602d880d5e8bd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/jJyWpsOf3IE/wb?keyword=how%20to%20start%20a%20richmond%20electric%20water%20heater
    • http://kinanoka.epizy.com/how_to_pronounce_neil_degrasse_tyson.pdf
    • http://zijedan.atwebpages.com/richmond_essential_gas_water_heater_reviews.pdf
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_5397a01e591d41dd8197ed3e1fa2890f.pdf?index=true
    • http://zesukojuwuveg.rf.gd/35616417124.pdf
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_a04229de3bbf4c2bb3678941077f6a75.pdf?index=true
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_edcf1299ab084674922febfd30d6e10a.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_off0000f037.bin
a6750ec72d6443ed0f9cac4290001b3a8c75ca5b0e87aed8589014936443bff3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF037 5232 bytes
font_01_sfnt_off000101df.bin
f789235f4ddcba276b191e0fbcc1401b51cc14fbe937c1cd84df52ce8bf0e58d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 10648 bytes

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