Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e970aca328294e…

MALICIOUS

PDF

91.1 KB Created: 2021-05-13 14:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7cd9b4b8a5b6bca2fc8633185958311d SHA-1: ee685999ea3369f5aff462c87d47b32d428796f4 SHA-256: f5e970aca328294ed6121dc6cd5949f805c9314cc40312959deda72cd84d7d56
184 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. This indicates an attempt to lure the user to a potentially harmful external site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL is sufficient evidence of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=which+is+the+best+book+for+ethics+upsc In PDF document text
    • https://cdn.sqhk.co/kapapomabu/dIjdDRM/11366561296.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/acuerdo_final_de_paz_colombia.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/365_day_challenge_ideas.pdfIn PDF document text
    • http://muzoc.xyz/luzoduzkzrzz.pdfIn PDF document text
    • http://kind-insta.site/vaveligophr9y7.pdfIn PDF document text
    • http://futegejetebe.22web.org/16937854435.pdfIn PDF document text
    • https://cdn.sqhk.co/manoxixo/C9Ojhib/32779039194.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/fUkggrt/golf_score_counter_apple_watch.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/hVRVihg/flickr_photos_disappeared.pdfIn PDF document text
    • https://cdn.sqhk.co/bezorufuv/biiG6Qv/44988012990.pdfIn PDF document text
    • http://zzzmmmmejjj.space/plot_of_heart_of_darkness_by_joseph_conradw95pl.pdfIn PDF document text
    • http://neojust.ru/food_bank_of_siouxland_sioux_city_ia1910f.pdfIn PDF document text
    • http://netewe5.xyz/faceing_math_geometry_lesson_2_answer_key7d2w2.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/08db4c01-3ee3-47ca-aa36-41552408292b/sony_icf-c1_alarm_clock_radio.pdfIn PDF document text
    • http://puwagof.rf.gd/concise_idiosyncratic_gapped_alignment_report_cigar_string.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed720c24-079a-4892-86ab-89712c90b163/samorowifiduzuvez.pdfIn PDF document text
    • http://nowimirozox.atwebpages.com/how_to_use_a_greenworks_2000_psi_pressure_washer.pdfIn PDF document text
    • http://fabedidatifi.onlinewebshop.net/biopsychosocial_model_of_health.pdfIn PDF document text
    • http://kubemumibesedu.epizy.com/94006883512.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/nojadiduvavap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f076bbec-9e3e-40d5-96f6-447db4fc0176/fomaradikepizese.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/neziguzumej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b507e8f3-a51c-485a-8566-85a8e4c5f9c7/56899962069.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/11266406349.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d238380-513c-4319-9862-ad22e886327f/996112159.pdfIn PDF document text
    • http://lusajafimaneru.myartsonline.com/unit_6_geometric_proof_answers.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_off000125b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 5080 bytes
SHA-256: ae415f3ed9f80505ea63be4ccdf4426c3579c6ba6fea8c5ac85c3f28a93a6590
font_01_sfnt_off0001370a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370A 11028 bytes
SHA-256: 9f624b17d28c119112c744ee933b06bc7588a450b522dcfef79dadffe124315a