Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0ff59f4c92e704…

MALICIOUS

PDF

92.3 KB Created: 2021-06-08 11:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: aa454e5e5fb3d7184f6e527b8441edf1 SHA-1: ecce50e32b2cfabd077b4c79c90b3ccf7f1dd121 SHA-256: 8d0ff59f4c92e7041acc6c2cb885d5c044d5f844b25765eb2859bc24e2fa8af2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to a suspicious domain ('queure.ru') that appears to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true malicious destination by using multiple disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://queure.ru/pbw?utm_term=ankush+lamba+100+puzzle+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368481/normal_6045099d1c530.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461232/normal_5fe4e4bc14282.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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/4db22433-1019-4b8a-a8f6-c4620b6d4f76/3rd_grade_multiplication_worksheet_free.pdfIn PDF document text
    • http://dumogaluz.pbworks.com/f/how_to_calculate_depreciation_using_the_reducing_balance_method.pdfIn PDF document text
    • http://zexowisam.pbworks.com/f/tuzowajipi.pdfIn PDF document text
    • http://nafidob.pbworks.com/f/closed_syllable_word_lists.pdfIn PDF document text
    • http://juxivos.pbworks.com/f/58933521156.pdfIn PDF document text
    • http://zusemivak.pbworks.com/w/file/fetch/144624981/rise_of_the_tomb_raider_cold_darkness_achievement_guide.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/w/file/fetch/144497352/pososalupi.pdfIn PDF document text
    • http://fubajulak.pbworks.com/w/file/fetch/144704061/fibegufaxibalosuriwuwo.pdfIn PDF document text
    • http://bolotomatub.pbworks.com/w/file/fetch/144810705/partnership_accounts_lecture_notes.pdfIn PDF document text
    • http://lururefisu.pbworks.com/w/file/fetch/144816774/badinerie_partition_piano.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/f/borderlands_2_bore_skill.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/geluxer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe51616-47f0-430f-b91a-adb905bb502a/dungeons_and_dragons_character_sheet_app.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/w/file/fetch/144445893/fakevusapesanonedidov.pdfIn PDF document text
    • http://wusajigi.pbworks.com/f/a_moment_of_silence_midnight_iii.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/is_code_for_bulk_density_of_aggregate.pdfIn PDF document text
    • http://dumogaluz.pbworks.com/w/file/fetch/144747447/sound_questions_and_answers_class_8.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144671202/magazin_google_play_download_pc_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa7bb1c9-9c2c-4124-bee3-b896bce21289/88479473433.pdfIn PDF document text
    • http://fujiserefi.pbworks.com/w/file/fetch/144808371/50980320581.pdfIn PDF document text
    • http://dipoziw.pbworks.com/f/quran_in_hindi_text_with_arabic_pronunciation.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 5468 bytes
SHA-256: ba51b0dcfc32059faca8b023d11965291b041b8f79b2e496a608fce6b295a604
font_01_sfnt_off0001049e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049E 11304 bytes
SHA-256: d480940569bb0ca8b2b20bab91a25df94d43cd1f42276e08e50c21f6b59e1fbf
font_02_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
font_03_sfnt_off000138b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B8 13360 bytes
SHA-256: 23c03df80741bd92e1ec9276855862b9d731a1b02c9ab4a49ebaa560b8216422