Malicious PDF — malware analysis report

Static analysis result for SHA-256 85df4be03f6eb2bb…

MALICIOUS

PDF

110.4 KB Created: 2021-05-17 06:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 47d1b9e5fd97e1859fb8967ea658bfa6 SHA-1: 81908d0e8a3f14857a5d6c5ff0d8b496be132f38 SHA-256: 85df4be03f6eb2bb09da785757377a3254812ee1d30c656f81a5336ba711fe00
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The document body, though heavily obfuscated, suggests a lure related to essay writing, which is a common tactic for phishing or malware delivery. The presence of external URIs and the link farm heuristic indicate an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crophysi.ru/strik?utm_term=how+to+write+an+argumentative+essay+step+by+step PDF link annotation
    • http://cleaner-inn.club/meeting_minutes_template_doc_freen7grd.pdfIn PDF document text
    • http://airbin.top/cuento_sapo_y_sepo_inseparablest1nqs.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/QjcFidk/malejezawobubigowulalolin.pdfIn PDF document text
    • http://cetakchantek.com/teduwinizufotzrsty.pdfIn PDF document text
    • https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/natozisi_piwiparip_detufozure_muvivoxapuz.pdfIn PDF document text
    • http://itwomen.space/data_abstraction_problem_solving_with_c_7th_editionjrb2d.pdfIn PDF document text
    • https://kidodizaramaba.weebly.com/uploads/1/3/4/0/134096495/3258334.pdfIn PDF document text
    • https://negazebofukiwan.weebly.com/uploads/1/3/5/3/135318678/5ba6e09bb0f6ddb.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/cjhie3H/loop_taxi_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/kogujipubap/SDjhbhg/23339929868.pdfIn PDF document text
    • http://raifaisentgo.online/lalazemunozvibr.pdfIn PDF document text
    • https://cdn.sqhk.co/tudosiki/gghnUif/origami_valentine_heart_box.pdfIn PDF document text
    • http://fanelafimud.22web.org/monuwekefuzibidagepa.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/e14b3c3c-b836-40f4-9cb7-df8ac9a828ad/ganimugawepudulafovoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501bf544-7e1f-4888-aa84-909684547d8e/rirejadevunodoxigoz.pdfIn PDF document text
    • http://fuvogixus.epizy.com/isometric_grid_paper_1cm.pdfIn PDF document text
    • http://rojaxenutu.rf.gd/hardest_logic_riddles_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c47d090-fff0-48c8-b290-b52c49c9ec39/what_is_compound_and_complex_sentences_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f54ec8a-2ad8-47e6-ae4a-07a43266fb2f/get_tough_movement_aimed_at_immigrants.pdfIn PDF document text
    • http://kibozitasosisan.epizy.com/comedy_cartoon_movie_video.pdfIn PDF document text
    • http://gadabejevetel.epizy.com/gusaporukijofemukavibed.pdfIn PDF document text
    • http://jejemizon.rf.gd/lasonakiwa.pdfIn PDF document text
    • http://zetiragala.epizy.com/acknowledgement_sample_for_report.pdfIn PDF document text
    • http://gezexibubaju.rf.gd/numesobadekiwegasomedib.pdfIn PDF document text
    • http://raxusitusumulag.rf.gd/admixture_software_manual.pdfIn PDF document text
    • http://fewabawunidud.epizy.com/85205061716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f072925-b2a4-447e-8989-d94650bb90dc/gasibepekuwogurem.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_off00017355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17355 5464 bytes
SHA-256: 6b6d1f110d4db4227b3c03d4d7f4412d6a19b2ea097d4faefc3d60c1ab58cedc
font_01_sfnt_off000185ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185EC 10976 bytes
SHA-256: 73df38edf6eeac7fb204175ff46a9e734dd3f8e5898c75b6b6aad7d1d1677a25