Malicious PDF — malware analysis report

Static analysis result for SHA-256 668094f5c886a2d6…

MALICIOUS

PDF

81.0 KB Created: 2021-05-17 08:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03f2b87edb5949e4d632d06dc050478e SHA-1: 7d60b7c75b3a824d855a5219317953f42effe3fc SHA-256: 668094f5c886a2d6e00be180aaa306c3c74032cdec3d3dd21692ccaa99c71859
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The embedded URL points to a website that appears to be a link farm, likely designed to redirect users to malicious content or phishing pages. The document body, though heavily obfuscated, contains keywords related to a product search, suggesting a lure to trick users into visiting the external URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wb?keyword=laptop%20acer%20aspire%20e%2015%20e5-575-33bm PDF link annotation
    • https://cdn.sqhk.co/dusawugivepo/cDPUMhd/8127926916.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/john_deere_x320_hood_removal.pdfIn PDF document text
    • https://cdn.sqhk.co/karapazepot/ULsGzJr/last_uncivilized_island.pdfIn PDF document text
    • http://baby-slings.ru/55836705967k8439.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/gN1p3nI/83061072349.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/Zto8Bje/magnum_ice_cream_triple_chocolate.pdfIn PDF document text
    • http://xuwavugox.22web.org/analise_swot_livro.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/fasuvojunope.pdfIn PDF document text
    • http://trychambre.xyz/intake_form_template_word_freektfbm.pdfIn PDF document text
    • https://cdn.sqhk.co/wabitakenina/iviggfP/77750391184.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/KiiMTa0/robo_shark_movie_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/07447094-c675-44c5-8c2a-26c131bae28c/87069061577.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f7a3a4-c684-4d8c-be02-5ce49f57bed9/femuxo.pdfIn PDF document text
    • http://lulojoduvos.epizy.com/95801362250.pdfIn PDF document text
    • http://dasobiviwadodaj.atwebpages.com/ocean_of_legal.pdfIn PDF document text
    • http://doketam.rf.gd/clear_streaming_media_player_android.pdfIn PDF document text
    • http://rodexiguv.onlinewebshop.net/guxegoxesuje.pdfIn PDF document text
    • http://walevuzu.epizy.com/the_study_of_human_geography_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02bd549c-9138-4a45-bba9-2dd06d850368/basic_english_module_for_beginners.pdfIn PDF document text
    • http://bubomikofar.epizy.com/mental_arithmetic_book_5_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1e30429-7f31-4352-b39a-0ce3d42a4e26/judosawuridibala.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_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 3044 bytes
SHA-256: 0a4b5c31f4257e5a2707017370dcf829c84058060820f6748bf1d2aeb2c81f0e
font_01_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 5580 bytes
SHA-256: 538315ec8ef465ad35f6cebcacafd75eda3901eb009d57b64370b24e8a62fb77
font_02_sfnt_off00010d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4C 12016 bytes
SHA-256: b953dcce5bbdcf9956abdaed30dfbfe5997e168ae2a4380123e884e790a6e5e8

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