Malicious PDF — malware analysis report

Static analysis result for SHA-256 db53e9001cffab8d…

MALICIOUS

PDF

72.2 KB Created: 2021-03-25 09:58:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab3fda1658b1d606a240a011e9b7fea8 SHA-1: d9184f4fa75cc5cf6392fb06b6ded3a66a9652ee SHA-256: db53e9001cffab8d41ac70193c48cc1179e98f2f5f66cfa057561383e2c53fe5
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to educational materials. The presence of a large number of external links, including one pointing to 'kuzutuzo.ru', indicates a potential link farm or redirection mechanism for malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuzutuzo.ru/wix?keyword=james+stewart+calculus+early+transcendentals+7th+edition+solution+manual+pdf
    • http://kujubawakini.22web.org/what_is_vygotskys_sociocultural_theory_of_cognitive_development.pdf
    • http://fojozefamofu.22web.org/kupezowa.pdf
    • https://lekusilikeveb.weebly.com/uploads/1/3/0/7/130739001/4b5cdca1d48476.pdf
    • https://tewazaxapij.weebly.com/uploads/1/3/4/8/134873756/lamivemi_xenorabeduj_fidazi_nunodew.pdf
    • http://bezigex.iblogger.org/lafezoriwigulepixibet.pdf
    • https://tepimetasufiro.weebly.com/uploads/1/3/4/0/134012902/fagupulunaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bikikanafopavu/lady_boss_movie_audio_songs.pdf
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_25ec6cb965e6416f84409093eb8149bc.pdf?index=true
    • https://s3.amazonaws.com/sifawekujiki/how_do_you_adjust_the_carburetor_on_a_poulan_wild_thing.pdf
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_75f7bc0e88624c4dae25b9d2060d1e6c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/453a322c-9aff-4fc0-9dfc-3a6e0db45678/what_is_nature_of_management_process.pdf
    • https://uploads.strikinglycdn.com/files/fad7c871-598f-4c49-a31d-97b748c02a83/what_is_a_jbl_flip_5_speaker.pdf
    • https://uploads.strikinglycdn.com/files/b6102690-b3de-4448-874c-1952eebf00a3/33425660979.pdf
    • http://lavodusepigixu.rf.gd/briggs_and_stratton_675_series_pressure_washer.pdf
    • http://kagiwabiluwotel.epizy.com/vafedevav.pdf
    • https://s3.amazonaws.com/podawakumepewez/on_eagle_s_wings_music_sheet.pdf
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_b7ccd4ae9bad49e69a77fb238f605dbf.pdf?index=true
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_bfd521ccd3cc4edab62a4d6ba4c1fde8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b373c352-f49a-4487-b014-8361bd99aca0/navien_ch_240_manual.pdf
    • https://314a97e4-cc7b-499c-a999-42b15fb65c39.filesusr.com/ugd/fa4a73_66285737d9fd477ba028e568b50d56f9.pdf?index=true
    • https://s3.amazonaws.com/zalisujezajaje/lukimufaxasikoxulenexikuv.pdf
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_694fb9b457404e3485943bc8067076ab.pdf?index=true
    • https://uploads.strikinglycdn.com/files/35521100-e99b-44e5-ac59-b78b4446e216/blood_bowl_2020_skills.pdf
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_1a292f0d7fee4da6a8176f97d83d28c2.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_off0000db49.bin
a28503a03d86adc670cdd788ecb98209699fb8871841424f706ea22c3138bc91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 5656 bytes
font_01_sfnt_off0000ee85.bin
88105507546db9e4c516c246fd31195bb6637a1133219073e05f33bb44633eb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE85 10532 bytes

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