Malicious PDF — malware analysis report

Static analysis result for SHA-256 343f651b38736e36…

MALICIOUS

PDF

82.1 KB Created: 2021-03-08 15:18:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d2a387c564d16c6039451192b57a952d SHA-1: 8729714f6924f108308e652f3b8b9022a12d1284 SHA-256: 343f651b38736e36e10a30a59b183741b76c09415f1b49b7f71b0f3a353a4609
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to a link farm hosted on disposable domains, suggesting an attempt to obscure the final malicious destination. The document body, though heavily obfuscated, contains references to wkhtmltopdf and PDF metadata, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/wb?keyword=is%20the%20disability%20pension%20income%20tested PDF link annotation
    • https://cdn.sqhk.co/buzulexoxuve/ghfhbhb/fazurapotuz.pdfIn PDF document text
    • http://bilenilabokadox.22web.org/250_word_college_essay_template.pdfIn PDF document text
    • https://cdn.sqhk.co/bosamame/hepgjji/30125086550.pdfIn PDF document text
    • http://naturelofo.mypressonline.com/percy_jackson_movie_3_in_hindi.pdfIn PDF document text
    • http://lipuwisapi.mywebcommunity.org/mtd_yard_machine_5hp_chipper_shredder_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/jutalufelex/hbudjfO/tapukewa.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/sowezebaz.pdfIn PDF document text
    • http://ketadiets.site/warhammer_fantasy_battle_mapbum7s.pdfIn PDF document text
    • http://creditscorehelp.info/free_avi_to_mp4_converter1lakf.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/ighcHdE/starbeam_runner_adventure_park_west_bloomfield.pdfIn PDF document text
    • http://pobadabodoz.scienceontheweb.net/victoria_secret_newsletter_sign_up.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suwutosu.epizy.com/how_to_insert_cells_in_google_sheets.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_de3d803ace6a4bf4b07db52c23242123.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/al_hikmah_homework_website.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/heart_of_darkness_short_story_summary.pdfIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_c93a6902fc574b8d9d8837360920d5cb.pdf?index=trueIn PDF document text
    • http://benugafudom.epizy.com/9322959054.pdfIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_843137ce72804feab34a428be5e122b3.pdf?index=trueIn PDF document text
    • http://govatojajij.epizy.com/openam_6._5_admin_guide.pdfIn PDF document text
    • http://kawurox.epizy.com/diversification_alimentaire_bb_6_mois.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 5396 bytes
SHA-256: 152bb3b2bba72bf352ff24702cd4e30596bdbeb63d077d5ae94d19ce6714fd53
font_01_sfnt_off00010a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A71 2264 bytes
SHA-256: ff9489ab4b8b5496e724627dd786112dc91264b1a06c1818f264134e3219e1fb
font_02_sfnt_off0001149a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 11332 bytes
SHA-256: 15fcef0a3155b2938de263643925ca8493aeb4f243a3b2c3d9f28bdacde564af

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