Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5cfea55f236aca…

MALICIOUS

PDF

75.6 KB Created: 2021-04-01 04:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f47edd4067cf15683a013de3dcda9671 SHA-1: 790ca9f81a60aa3fa3642dbd3325f8b98588df4a SHA-256: db5cfea55f236acaff2a0b95cfd032a6d5ffbe1a05b86206accf2a771296dcbc
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or domains associated with link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to 'building repair and maintenance management' which likely serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/award?keyword=building+repair+and+maintenance+management+pdf PDF link annotation
    • http://bukanugizini.mygamesonline.org/workout_book_with_pictures.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/sodigubaruwus.pdfIn PDF document text
    • http://lulodexov.scienceontheweb.net/49268389464.pdfIn PDF document text
    • http://rotiwopofeze.mywebcommunity.org/31987811847.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/von_mises_vs_tresca_stress.pdfIn PDF document text
    • http://zajiledafalam.getenjoyment.net/99916225199.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/epWXVjf/strikers_1945_world_war.pdfIn PDF document text
    • https://cdn.sqhk.co/kawaniroti/LgiAR6W/dog_toy_bubble_machine.pdfIn PDF document text
    • http://jefijunanupe.sportsontheweb.net/difference_between_hydraulic_and_pneumatic_system.pdfIn PDF document text
    • http://zavolofa.mygamesonline.org/grade_12_precalculus_textbook.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/7266721691.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://uploads.strikinglycdn.com/files/c91ca0b5-c2bf-4488-a792-2ac973ec163a/what_are_the_signal_words_that_point_to_a_solution_in_this_passage.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/juwufewoxopapexisudaniti.pdfIn PDF document text
    • http://telifujovemevo.atwebpages.com/solucion_isotonica_hipertonica_e_hipotonica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f021f05-ec94-42f0-867d-8a95c15d4c09/nazogezex.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/spec_benchmark_free.pdfIn PDF document text
    • http://xepuzakudera.atwebpages.com/gezufogulirefakazusofaduz.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/wagner_905_power_steamer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bfd0086-e715-47bd-acaa-39c23196c245/origin_of_species_meaning_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/suunto_ambit_replacement_strap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d90a6ac1-ae94-460f-ba32-c2a4d2d880a5/zyxel_c1000z_firmware_update.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87e67ae1-4043-4076-8508-72caa6a75d78/how_to_set_up_singer_promise_2_sewing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/25574646139.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_off0000dd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 5116 bytes
SHA-256: 1e19316fd91b1a0738587d747d9123202d8c019b18be1a3e8f6acf3acece456f
font_01_sfnt_off0000ee54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE54 10632 bytes
SHA-256: 686df1a18376cc413236f1a6b85500e1e3aeea4a171231a6ad3399749c49a64f
font_02_sfnt_off000112ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AC 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176