Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a87348f7fdb519…

MALICIOUS

PDF

73.3 KB Created: 2021-03-22 12:15:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91b3044e1c0b88b4a38f33188a424521 SHA-1: d05bd4113a0d4a63b16927fa249127fdb67b8e67 SHA-256: 76a87348f7fdb51908f75765d3c5d2d3b8f8898afd9486fa0c637cc86d48fa0b
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 of which are SEO-optimized and point to other PDFs, suggesting a link farm designed to attract traffic or distribute malicious content. The primary external URI points to a URL that appears to be part of this scheme, likely serving as a lure for phishing or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

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-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://kuzutuzo.ru/award?keyword=coldplay+yellow+piano+sheet+music+pdf
    • https://lebabipiw.weebly.com/uploads/1/3/0/9/130968925/busiguwonez_xanojodoj_zamesoko_xivuguk.pdf
    • https://cdn-cms.f-static.net/uploads/4475565/normal_600a6ee5231e8.pdf
    • https://static.s123-cdn-static.com/uploads/4425010/normal_5fe0499f72405.pdf
    • http://cccckkkkkdd.space/interview_questions_ece_freshersufqws.pdf
    • http://muzhskoizhurnal.ru/vexumiganjgfhc.pdf
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/fofibalimusulap.pdf
    • https://cdn-cms.f-static.net/uploads/4387928/normal_602febb4459b1.pdf
    • https://cdn-cms.f-static.net/uploads/4502906/normal_6030dd4378a40.pdf
    • https://cdn.sqhk.co/tijatabov/h6JETv9/41059865230.pdf
    • http://aromaita.space/ancient_board_games_irving_finkel07w9k.pdf
    • http://amorexpo.com/kotafiwujaketuvuncjj4u.pdf
    • https://cdn.sqhk.co/ponesigis/MUllibE/screen_time_passcode_ios_12.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/suxugipipolazog/54761276686.pdf
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_d7b049f7cb5940d3bc92e2613dceff2c.pdf?index=true
    • https://a134ef9b-a212-4d8e-a35f-da3d896bbd40.filesusr.com/ugd/dadc92_45b406cf032a4cd49282d4d676d47d51.pdf?index=true
    • https://s3.amazonaws.com/vebenok/universal_studios_transformers_ride_scary.pdf
    • https://f3dc8d0a-397f-4303-99a5-a7927e83d850.filesusr.com/ugd/e916cf_c7d1da91b8ca454db5aef33bb50c64d0.pdf?index=true
    • https://s3.amazonaws.com/vavejijitatofu/atualizar_android_tablet_samsung_gt-_p5100.pdf
    • https://s3.amazonaws.com/pazatuv/buzoxe.pdf
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_be4cbc1b73ac4a84bb95bb34f6380f71.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_off0000e0c8.bin
5d0fd4ecdd98f91ee2fd015d842a10757472d9c6516f6136c93aa26b29e86b58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 5400 bytes
font_01_sfnt_off0000f316.bin
0b46d7867cba7a42037d21de976ec9d5e3b77b0778f48ec94f4874bb1e00bfd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 10704 bytes

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