Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57747fe6cb270ff…

MALICIOUS

PDF

78.5 KB Created: 2021-03-19 17:35:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b1ce08edecedcac0d186045dc623ffa SHA-1: d1e0e92d3ac68131ed9abfde6129d686207297fe SHA-256: a57747fe6cb270ff21d616e0ef8b231f77401f0a05d7057cb06f9f6460b9b45e
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs, including a link farm on disposable hosting, suggesting an intent to redirect users to potentially malicious sites. The presence of embedded URLs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/123?utm_term=arambam+song+tamil
    • https://nokaxogu.weebly.com/uploads/1/3/4/5/134520383/xikobudame.pdf
    • http://dunewewibi.22web.org/globo_reporter_andaluzia_reprise.pdf
    • https://mekapejodefab.weebly.com/uploads/1/3/4/7/134740006/xugenapiwelunesa.pdf
    • https://mefuwowenapes.weebly.com/uploads/1/3/4/6/134611128/3334660.pdf
    • https://cdn.sqhk.co/nodewanase/Cijc8Hn/65795233418.pdf
    • https://lojixakukitut.weebly.com/uploads/1/3/4/6/134605905/runuxafiwigolix-fixafelokug-zatuxis-wufowaneze.pdf
    • https://cdn.sqhk.co/dakizenewa/hRgeihr/tamil_fm_radio_app_for_pc.pdf
    • https://cdn.sqhk.co/lerapuraroke/ji34iah/77939895074.pdf
    • https://cdn.sqhk.co/gixejefi/Roqjibt/pba_2020_tournament_of_champions.pdf
    • http://larebalin.mypressonline.com/maths_word_problems_for_grade_2_addition_and_subtraction.pdf
    • https://pilewamef.weebly.com/uploads/1/3/4/8/134849526/nuwekakexigoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bubeto/sinekotunifiziriruvuxe.pdf
    • https://uploads.strikinglycdn.com/files/2ab65d2c-888c-4508-a130-b9cae7c00361/23791342072.pdf
    • https://uploads.strikinglycdn.com/files/83c2ab8c-b171-4424-bfa0-c492cbf8c4d0/tolopenoj.pdf
    • http://zabirozoxut.epizy.com/financial_report_dashboard_examples.pdf
    • http://sinusudixuxuwad.atwebpages.com/how_to_make_diaper_genie_refills.pdf
    • http://bologipegokofi.epizy.com/91014920442.pdf
    • http://juwijez.rf.gd/12v_battery_charger_with_auto_cut_off_circuit_diagram.pdf
    • https://s3.amazonaws.com/gurafoga/63527930333.pdf
    • https://s3.amazonaws.com/remavuj/cayley_transform.pdf
    • https://s3.amazonaws.com/sajatesawodiji/delafatizuvuvivekozis.pdf
    • https://uploads.strikinglycdn.com/files/e1119558-3cba-4a65-9371-b5853ac7f557/volurexiruxu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e879.bin
5664603883e7ece45de61853b244570b8c3a1f5f71191eb8662352d065afb3ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE879 4804 bytes
font_01_sfnt_off0000f89f.bin
6bcd46d8c52a905dfeb094219cf7eae19f09923d92bbb71e95273146f7ab19a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 11248 bytes
font_02_sfnt_off00011f0a.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0A 4324 bytes

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