Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a37feeaa83e503…

MALICIOUS

PDF

78.9 KB Created: 2021-03-02 02:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f43bea979b999eb80184a74d9e232546 SHA-1: b2a08377e7da30f9f36748f290a4bf85e19dd21d SHA-256: 57a37feeaa83e5035459fe0f0ce0986ee91b4ea65834387114c996ce1a8c56b5
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple external links, with one heuristic specifically flagging a link to an algorithmically-generated URL on 'igbusinessabouthelp.com'. The document body, though heavily truncated and obfuscated, suggests a lure related to school uniforms. The presence of numerous external links and the ML classifier's high confidence score indicate a malicious intent, likely for phishing or to redirect to a malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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/strik?utm_term=3+reasons+why+school+uniforms+should+be+banned PDF link annotation
    • http://xomapometafa.iblogger.org/formule_pour_calculer_les_taxes_dans_excel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414486/normal_5ff0101e1c005.pdfIn PDF document text
    • http://salestore.pro/lerobotisiduv1xzez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454046/normal_5ff75a7244779.pdfIn PDF document text
    • http://igbusinessabouthelp.com/wugijujakolepepanezizusognxftd.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/edith_margarita_lopez_martinezwqt4k.pdfIn PDF document text
    • http://gavowobow.iblogger.org/67395972401.pdfIn PDF document text
    • http://sq11mini.com/859508881013g3nf.pdfIn PDF document text
    • http://cupe1.ru/sway_michael_buble_sheet_musicwyaiy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470696/normal_5fc588ab7af97.pdfIn PDF document text
    • http://megatorg.ru/naxiduwupodikukerageferugkuhxk.pdfIn PDF document text
    • http://mbfsopg.com/org._apache._commons._lang3._randomstringutils_jarkm3l3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417128/normal_6004bbd549b36.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/61552064639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467017/normal_603cb2ebb795d.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/ravuxudibure/how_to_write_a_third_body_paragraph.pdfIn PDF document text
    • http://ruzowedomox.epizy.com/remove_drm_from_mp3_online.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/pukuguwafo.pdfIn PDF document text
    • http://letituxis.epizy.com/alternance_en_anglais_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/42985998799.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/2019_harley_davidson_touring_service_manual.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_off0000f644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 5664 bytes
SHA-256: ec08e146da0e70ef53e633b3130ff3d612a2e83cab24c37abad37d5d6b95850b
font_01_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 10844 bytes
SHA-256: 0d3e3b9f853cdc1e780f70543106c0f6d43ef6ad377be4e9b466b1cd41ef515c

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