Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81ec6a747846bc2…

MALICIOUS

PDF

74.7 KB Created: 2021-04-06 02:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b5056d1ebffc74d4e2fb5a101fd07cfa SHA-1: 77dfc8090f7148e586a75155372b45981638fadb SHA-256: c81ec6a747846bc2df16eecc82448d68784e0bb4207202acc7c56aa86f8e8b2a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 several pointing to suspicious domains like soxebez.ru and tesar-krd.ru, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://soxebez.ru/aws?utm_term=how+much+does+it+cost+to+get+a+pool+heater+installed PDF link annotation
    • http://tesar-krd.ru/female_reproductive_system_diseases6ok95.pdfIn PDF document text
    • http://easterthjg.com/metabolismo_del_calcio_fosforo_y_magnesiorcq4u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531523/normal_60530b40ef723.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391920/normal_5fe678214c1f2.pdfIn PDF document text
    • https://neruzubegakakew.weebly.com/uploads/1/3/4/0/134017499/getoxepefokusifag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460247/normal_5ff8684ec2ad5.pdfIn PDF document text
    • https://bopilopuneliniw.weebly.com/uploads/1/3/5/3/135304065/8407985.pdfIn PDF document text
    • http://awpmode.com/java_programming_for_freejwv8j.pdfIn PDF document text
    • http://naturaleone.space/brave_new_world_guided_reading_questionsk9e6q.pdfIn PDF document text
    • http://tehnopolis.org/what_soda_to_mix_with_crown_royal_appleaqjih.pdfIn PDF document text
    • http://nerroba.info/68175118533ej3y2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472783/normal_5fc6742342aa4.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/levumoduf/company_accounts_introduction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/731904a8-9bfa-423f-837e-1a4543dee235/how_to_use_a_single_use_keurig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cbcd292-f46f-4d47-8587-6aa6e89718fb/32540660577.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/besowelagomufakaxip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/513b8e93-f630-4a73-8502-70d5673c0a17/sears_12_band_saw_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/ye_bhagwa_rang_dj_song_mobilekida.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/where_is_marksheet_number_ssc_maharashtra_board.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/india_flag_pictures.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_off0000e6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C0 5540 bytes
SHA-256: 54995d078605ca26187cb6d2c8c803de9431c7e66f469a5891940cc9651b354a
font_01_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 10348 bytes
SHA-256: dcc3e688a2413423380fc6c348fd37ea28dce726dcb9161fed0905f03b74791d

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