Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f736501d9b2da3…

MALICIOUS

PDF

81.4 KB Created: 2021-04-25 05:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4143616d138ae5cb4cfb311645bd1c00 SHA-1: 8e6263472726391535f02783781d03f01760878b SHA-256: f5f736501d9b2da3467805d95f26fa4524f588b311f5fc01d981899eae710974
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('kuzutuzo.ru') that is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'installation', suggesting a lure related to software setup.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=proform+hybrid+trainer+pro+installation PDF link annotation
    • https://cdn.sqhk.co/tabakotodi/aairih8/74967473807.pdfIn PDF document text
    • https://cdn.sqhk.co/pibusupi/mgjuyCj/mibanelanud.pdfIn PDF document text
    • http://kusadelopo.iblogger.org/best_absorbed_form_of_iron_supplement.pdfIn PDF document text
    • http://gutufozif.iblogger.org/tipos_de_contaminacion_ambiental.pdfIn PDF document text
    • https://cdn.sqhk.co/libavesonon/nhhgggj/dune_movie_1984_streaming.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/CiiW9jj/bitsat_2020_application_form_fee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuwoguki.epizy.com/39058756472.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/how_to_make_render_in_minecraft.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_10452866f15347a1bf164d654750b5a2.pdf?index=trueIn PDF document text
    • http://rokupin.rf.gd/older_version_of_chromedriver.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/mejor_antivirus_tablet_android_gratis_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6caf2e81-eca8-4c1b-9f3a-8316569731ba/grade_or_standard_of_excellence_crossword_clue.pdfIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_4d5ee0653a73491db518be0207a5464b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/is_call_me_by_your_name_on_netflix_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/death_note_anime_episodes_imdb.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/xevija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa63532-06db-45a0-9d06-0902adf96ee7/end_of_the_world_song_hermans_hermits.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_816b35f10c114c4db3793d0385aca961.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e5bdb46-6ea2-4b7a-acf3-436a69ed690e/50_shades_of_grey_quotes_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92bad060-c715-4553-b207-e463033f0c0a/encyclopedia_brown_boy_detective_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a27471ae-066c-43af-b896-cf03e6b50958/49505205785.pdfIn PDF document text
    • https://7e8267f5-6380-480e-ad72-df526eaefc07.filesusr.com/ugd/cbe325_0b045e6c09c74f30b592000be3a46bd5.pdf?index=trueIn PDF document text
    • https://0ccb9a81-bd3c-41bd-bc79-2352350f0e5e.filesusr.com/ugd/95ea6b_3b4870c1a3b74ee3b5837eba31feeb23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d58479e6-5fb7-45e0-96ac-6bc81ab1e897/badger_5_garbage_disposal_1_2_hp_insinkerator_badger_5_with_cord.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37f50855-901a-4a57-b3aa-03e13f178199/35513221030.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/mu_cv_ting_nht.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2C 5524 bytes
SHA-256: 560807023c74e5ead525be215b26d6991d9f546a0d1699211e417163cd806756
font_01_sfnt_off000111c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 11624 bytes
SHA-256: 4f7ffaea95e7670479f453cc3274211e8d2beb21457905efe750973346ee38ac

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