Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c397ab13f93b8a7…

MALICIOUS

PDF

80.6 KB Created: 2021-03-19 04:37:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ffffb7dca940f2582ecc017792ff06ec SHA-1: 4c6c11697da6c2ab7c8dc1d9ac3d7ef66593bebe SHA-256: 1c397ab13f93b8a77756ec54f3916fb64da8bc77c6fa8370cc7e3590448f2dcc
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 critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with at least one pointing to a domain associated with link farming and disposable hosting. The presence of these external links suggests the document's primary purpose is to redirect users to potentially malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/wix?keyword=harvard+air+hockey+table+g03620 PDF link annotation
    • http://shoop-fl.ru/ldpe_bags_manufacturing_project_report2lbv3.pdfIn PDF document text
    • http://raifaisentapp.online/zilujarafajototordvtwm.pdfIn PDF document text
    • http://christinaanddavid2019.com/what_is_the_average_length_of_a_dachshundjuodp.pdfIn PDF document text
    • https://cdn.sqhk.co/fakodozug/hdahgjc/91736334449.pdfIn PDF document text
    • https://cdn.sqhk.co/bazexolareja/QyiiibP/28282601864.pdfIn PDF document text
    • https://cdn.sqhk.co/tirinakiweda/jdcXyij/73531370342.pdfIn PDF document text
    • http://evakuator-uga.ru/arthdal_chronicles_season_2_sub_indo4bqv9.pdfIn PDF document text
    • https://cdn.sqhk.co/pananele/fhbLggQ/rodaborenulisomox.pdfIn PDF document text
    • https://cdn.sqhk.co/voxobidivel/dhbTjiW/subway_vinegar_nutrition_facts.pdfIn PDF document text
    • http://znalomstvavip.site/2019_standard_catalog_of_world_coins_2001-date_13th_editionmqrim.pdfIn PDF document text
    • http://domavera.ru/use_of_shall_and_will5i3z5.pdfIn PDF document text
    • http://ru-1.casa/how_to_find_your_google_account_password_on_androidzelug.pdfIn PDF document text
    • https://cdn.sqhk.co/nesuxozajek/ifgfwjg/kw_to_amps_calculator_three_phase.pdfIn PDF document text
    • http://zoomita.space/file_profile._dat_dls_17as4aw.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/YAJjcsj/cops_and_robbers_game_2_player.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_089a86c1a8e74816a30fabdb52ab5adc.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_03561d38b3404a84b42abab65bb862fd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/16c0c4c5-05ca-4522-85d1-967ba9e4dec3/crossfit_level_1_training_guide_hard_copy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acbb96e1-d2be-4f4c-b4f6-a88d559c7644/chicago_electric_chainsaw_sharpener_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5993f09-db1d-4d59-b6a5-c5d682ed940d/99022787701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f684e0ea-c1d8-4553-8ed7-b83e4a460a07/random_sum_product_networks.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_01ef9793fa244c22a6487fdb88716f3e.pdf?index=trueIn 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_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 5624 bytes
SHA-256: 446c11a2fd4045908a3bb171fe15c9e7712f4d16008be5b8f0458a9f2129c916
font_01_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 11236 bytes
SHA-256: 6e8921a5e9db5cca3b28cf80f569e505ab86d63dd6a6738d27918d39af48d902
font_02_sfnt_off00012725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176