Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba7b309cb11cc89…

MALICIOUS

PDF

119.3 KB Created: 2021-03-17 14:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cf8efe919030ddb8e12ade1411dee50 SHA-1: 7dd2628f934061cd2a07b5f2638b7c6d34fbcaab SHA-256: aba7b309cb11cc89c6b216c289b2bc8ec85828284605c6f015fb6c6714f4062c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jumiwimov.ru/wix?keyword=i+know+why+the+caged+bird+sings+pdf+summit
    • http://lajodibibodi.getenjoyment.net/absorption_and_variable_costing.pdf
    • https://cdn.sqhk.co/gupikekarobo/hhzvmfE/fibago.pdf
    • https://cdn.sqhk.co/dutudovajud/cC1BXRy/7685432007.pdf
    • http://gosunenibunale.getenjoyment.net/37885652816.pdf
    • https://cdn.sqhk.co/nikajovefer/hjhjgrY/rukozaxu.pdf
    • https://cdn.sqhk.co/mivezifov/tmjeRii/lg_xboom_ck43_microcadena_bluetooth_300w.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bapomeguradoka.rf.gd/45597344613.pdf
    • http://diwejijozijigez.rf.gd/thing_explainer_xkcd.pdf
    • http://radiviwix.onlinewebshop.net/59621151118.pdf
    • http://sasukagisodubex.onlinewebshop.net/the_secret_river_thornhill_quotes.pdf
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_9f8678e06ac142fca29f35a584b36b44.pdf?index=true
    • https://uploads.strikinglycdn.com/files/640b8fc0-3a17-442f-862a-a2e12b256a08/george_orwell_essays_penguin_modern_classics.pdf
    • https://s3.amazonaws.com/suxugipipolazog/rakojax.pdf
    • https://uploads.strikinglycdn.com/files/22076221-78fd-4570-ac61-12d1b98f0a5e/92192084765.pdf
    • https://uploads.strikinglycdn.com/files/cb768cbc-fa62-4970-ba2a-530b544c69eb/tawunojadatugixirine.pdf
    • https://s3.amazonaws.com/vebogotexaf/livro_fundamentos_da_genetica.pdf
    • https://uploads.strikinglycdn.com/files/def0b377-278f-4640-905c-200a58ebdbbc/does_bitcoin_trade_all_day.pdf
    • https://s3.amazonaws.com/gaxuremewuger/long_vowel_sounds_worksheets_for_grade_1.pdf
    • https://s3.amazonaws.com/redegelesibif/jafujokavegumirogu.pdf
    • http://kazaxese.epizy.com/atualidades_para_o_enem_2020.pdf
    • https://uploads.strikinglycdn.com/files/bbf45793-d22f-4837-a8c0-3a9e071cceb8/75671934815.pdf
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_af87e034c6c949c5a32be96b587e5b8e.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000196e0.bin
e29084a378da69ed62148f0cfad8b276132a329c4ff7686b2abf95c65f83065e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x196E0 5872 bytes
font_01_sfnt_off0001aace.bin
33f8d350f88fc1495b7969961710fe995e4c03361bd398c4d30bc6c0336bd60c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AACE 10904 bytes

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