Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31284285355b2a5…

MALICIOUS

PDF

73.6 KB Created: 2021-03-24 03:39:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 72b12848486acb80f2cf78ed8e4e375e SHA-1: 5526f38bc33e507c0b81ed70840127ba778f0e05 SHA-256: f31284285355b2a5a1de8cedde635a86ca0d6f2072679fbdac396bd96de083df
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/wix?keyword=jesus+the+king+tim+keller+pdf PDF link annotation
    • http://copyrightnotices-form.com/pajisusuwapaliwepanogizi5oqo2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482645/normal_5ff68c82f17fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426953/normal_5fcdfd683810f.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/61360583670.pdfIn PDF document text
    • http://autoupgrade.website/102720604049j4y4.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/ggfha0n/frontline_commando_d-_day_full_mod_apk_download.pdfIn PDF document text
    • https://voxomusixexuso.weebly.com/uploads/1/3/4/8/134851372/gijufebixupin.pdfIn PDF document text
    • http://whysmall.space/ielts_writing_task_2_questions_20197rqx2.pdfIn PDF document text
    • http://ehaberdevlet.com/phrasal_verbs_dictionaryaec4w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446497/normal_5fd6632261645.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/peguweparwiy3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483856/normal_603db41be10ae.pdfIn PDF document text
    • http://fitnesspack.net/putekowogewezisitokzd7h.pdfIn PDF document text
    • https://cdn.sqhk.co/mibajufaneja/cWjgheS/brain_balance_program_for_adults.pdfIn PDF document text
    • http://zomoxoxuriw.mypressonline.com/xajuvapolipi.pdfIn PDF document text
    • https://muwujexowosis.weebly.com/uploads/1/3/1/4/131437891/5472067.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_602bd92c77c81.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/iirsh21/pictoword_level_66.pdfIn PDF document text
    • http://tersq.space/2018_toyota_camry_hybrid_se_used9ycb4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://benamow.myartsonline.com/86629129809.pdfIn PDF document text
    • http://pizuzol.onlinewebshop.net/hallelujah_chorus_bass_part.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_off0000ddd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD1 5300 bytes
SHA-256: 9ba83e38dcb0573de645ca8ad8b857e7d5d9e8ba5bc1894144b27993922dcc6a
font_01_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 11792 bytes
SHA-256: b1c1795096f90c6759f3b0edcd829111c47cb6850588e44ad5d354047c9a1ab5

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