Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f623509df2834c…

MALICIOUS

PDF

77.6 KB Created: 2021-03-18 15:12:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9d1c59eddd2c049b09913e365c268cf9 SHA-1: 88fa7a9b54b4e309c5d89275faede028d00a2e88 SHA-256: e1f623509df2834ce930017206e71baf8011b51953d563f74e361697d2d83e5b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various PDF documents hosted on disposable domains, indicative of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is not a legitimate document. While no scripts were explicitly extracted, the presence of external URIs and the ML classification suggest malicious intent, likely related to SEO manipulation or distributing further malware.

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://jacksth.ru/award?keyword=2020+data+science+and+big+data+analytics+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446038/normal_604a868ceb3ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fd67113d511f.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/jhVuUhf/the_outbreak_movie_online_sites.pdfIn PDF document text
    • http://pumba-timon.space/hp_envy_4500_printer_ink_level_symbolskt4ym.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/cqXjgjj/dojoni.pdfIn PDF document text
    • http://straponartist.com/vigarajelartj2jt.pdfIn PDF document text
    • http://batut.space/pegusokebesiked3v35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465274/normal_5ff9ca9ba34f7.pdfIn PDF document text
    • http://sayseedokg.com/the_taming_of_the_shrew_katherines_final_speech_analysisnybjs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467325/normal_5feb6ed0bfa82.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/iiegcgh/wallpaper_free_download_for_desktop_windows_8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447450/normal_5fd7dd7474780.pdfIn PDF document text
    • https://cdn.sqhk.co/bamopilu/1jhmWvs/vugabusameletizovewari.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/jEBfjdf/basic_training_survival_guide.pdfIn PDF document text
    • http://praktika-ingenieur.com/bluetooth_receiver_nintendo_switch_lited5xt3.pdfIn PDF document text
    • https://cdn.sqhk.co/ziveluki/MHjcoc9/vuxidume.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluniziwav/jy9MoR9/steve_madden_stretchy_platform_sandals_in_black.pdfIn PDF document text
    • https://cdn.sqhk.co/fowujizul/h05heIX/77869137848.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/goxuxureti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9fdc49d-c157-440b-825d-91ab0f3d832a/can_you_transfer_photos_from_iphone_to_digital_photo_frame.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/how_to_start_an_aa_meeting_online.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/04_dodge_ram_1500_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/bobinopuvuvopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7444ea6e-e829-4216-9b98-f5832d4b4efb/things_fall_apart_character_map.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_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 5648 bytes
SHA-256: e68d1cc445ae7f35adcdddabec30464f1b1d8661d71f120751af241be7997dd6
font_01_sfnt_off0001043d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043D 10832 bytes
SHA-256: dc4fbb646104872a4af0c750080bba0991147d83b50e60c2cb040dd7006da7af

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