Malicious PDF — malware analysis report

Static analysis result for SHA-256 492ec44c623ea25d…

MALICIOUS

PDF

79.7 KB Created: 2021-03-21 23:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3fa3f69d252d0ba4080d03ee87e26ad0 SHA-1: f7bd8f7ecd3937e94fdc7059b0905616d2460480 SHA-256: 492ec44c623ea25dc018ab127cf15bbbd677fe1472b5f8d5c7d1e8c0fcf77201
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting and contains external URIs. The embedded content, though heavily obfuscated, suggests a lure related to a 'Sasol bursary form'. The presence of numerous unknown-reputation URLs points towards a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/award?keyword=sasol+bursary+form+pdf PDF link annotation
    • http://pek-24.cc/86401620163uefj8.pdfIn PDF document text
    • http://artdebug.site/texas_land_lease_agreement_templatedt38c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391024/normal_5ff7af187f98f.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/bhagavatam_in_kannada.pdfIn PDF document text
    • http://jeseselanus.scienceontheweb.net/ch_i_bi_ting_phn.pdfIn PDF document text
    • http://fumuroruzej.medianewsonline.com/14893863031.pdfIn PDF document text
    • http://itdiscounts.info/what_is_the_magna_carta_and_what_features_explain_its_historical_significance979nr.pdfIn PDF document text
    • http://subonus.ru/29464671236nehc9.pdfIn PDF document text
    • http://jijomaj.getenjoyment.net/kefufarutopano.pdfIn PDF document text
    • http://sarhello.online/citizen_eco_drive_watch_wont_set_timer4i1y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405179/normal_5fcd88db61274.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c1359d-2b82-4131-a347-eb1a682a44ce/59239191777.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_9befceaeaec14a80ad6318e85c5096c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/kebila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/161b90fd-c3a1-4bd0-bf74-a0e00b0fa734/wozubezazalenilusefeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9703f838-cf8c-4b95-8c0a-d2bc50010a73/qualities_of_a_good_teacher_essay_in_telugu.pdfIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_92818fa3ae424eaca0e542245d3d58f7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/nipezudasitijawo.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/vixokekep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c71b9ddb-3587-4c3a-9fd0-c0d7fdbd6bdf/84200609873.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_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 5532 bytes
SHA-256: e0bc10db862ef7c47118a36dfc2582c4043eca7d951cf9659ef460b3e1a82a85
font_01_sfnt_off000109a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A3 11424 bytes
SHA-256: e38754f424f674657315dfaab7820081648510a49bce9b3a06e02c38822d53fa

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