Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad5320500d56d69…

MALICIOUS

PDF

76.4 KB Created: 2021-03-19 20:08:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9afc1e73c65159c765a1945c0c5b839 SHA-1: 2b53f03a4529a5932de6851e092353ecde558a35 SHA-256: 3ad5320500d56d69fbe6bd144eea9cb6e74dd5d780fffcb417463a96b97767c9
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=best+fiends+forever+hints
    • https://gibinebixupiv.weebly.com/uploads/1/3/1/3/131379057/30c39a9b.pdf
    • https://xunumiselodaz.weebly.com/uploads/1/3/0/7/130775676/c743b7e3b.pdf
    • https://cdn.sqhk.co/guzowozuk/jdicGia/26880856269.pdf
    • http://jobopenufa.iblogger.org/engine_oil_analysis_guidelines.pdf
    • http://fuwenosod.iblogger.org/babasaheb_ambedkar_photo_2019.pdf
    • https://cdn.sqhk.co/rodesedaded/bLgdKMJ/mezokaxojozilipiluxuduji.pdf
    • http://maxiteguf.medianewsonline.com/59064581232.pdf
    • https://rudumareta.weebly.com/uploads/1/3/1/8/131871695/a9df7.pdf
    • https://norofuzalugegok.weebly.com/uploads/1/3/4/8/134882219/tevovanemuriloza.pdf
    • https://cdn.sqhk.co/kavuluxaja/cibgjud/loch_ness_tv_series_episode_guide.pdf
    • https://cdn.sqhk.co/kewixoretuze/vGniahh/96556978767.pdf
    • https://migokenumepo.weebly.com/uploads/1/3/1/4/131454620/makojaloridebu-gizuxosa-vatibukigomazed.pdf
    • https://cdn.sqhk.co/demawanetufi/gzpWbNv/top_trending_tiktok_hashtags_right_now.pdf
    • http://befotuke.mywebcommunity.org/ornish_diet_menu.pdf
    • http://tefiwofo.22web.org/bayesian_parameter_estimation.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_2c910048218c4382a83bc509b33be910.pdf?index=true
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_1ebe85229ee94fff91aa8da192fa801e.pdf?index=true
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_6e415e8ce11c491f8fed6dc7c54b9995.pdf?index=true
    • http://dumudolaba.epizy.com/avatar_2_tamil_movie_720p.pdf
    • http://setevibebevu.epizy.com/luwezosibulikadigogu.pdf
    • https://f77c8dad-41d7-4a8f-8d8d-c05149a3a236.filesusr.com/ugd/36d413_8482d3f5dc8b4308ad056f0b279a9944.pdf?index=true
    • https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_a184379b5d284647bd9f5c479aad0217.pdf?index=true
    • http://tupapepebaraj.rf.gd/limive.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_off0000ec27.bin
9adc0aa190f5707ba0ee673eb2c186947168e56fe62cf89d5c4548eb69f58385		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 4864 bytes
font_01_sfnt_off0000fcbb.bin
3e3fd44c3ac1520e366d052acc25b05f5094a9c90497cea4e3dfd96cb82befa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 11196 bytes

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