Malicious PDF — malware analysis report

Static analysis result for SHA-256 307fad132d10b31a…

MALICIOUS

PDF

73.4 KB Created: 2021-03-18 22:49:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e514d52b7a66d2cc39da0e0177697e63 SHA-1: 9bd2f502915277dc5007e86c1f87a72c45d07c66 SHA-256: 307fad132d10b31a48b53f31ba52db6f6fe2f2823d0006eecf815e388a0e3a05
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 0.9996

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://nipisod.ru/wix?keyword=the+chemistry+of+life+biochemistry+answer+key PDF link annotation
    • https://mabalajobiken.weebly.com/uploads/1/3/4/0/134016714/zoduberinikexo_sumosafivu_mopon.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/programing_abstractions_in_c.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/pofesezijuki.pdfIn PDF document text
    • http://tepoparupomo.medianewsonline.com/43299621503.pdfIn PDF document text
    • http://negeduji.66ghz.com/38685344385.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/37957568062.pdfIn PDF document text
    • https://daxekofaji.weebly.com/uploads/1/3/1/6/131606395/gevijobogevi.pdfIn PDF document text
    • http://sutarakikim.scienceontheweb.net/honeywell_xenon_1900_driver.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/electricity_and_magnetism_study_guide_quizlet.pdfIn PDF document text
    • http://wirobigi.medianewsonline.com/accept_vs_except_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gadoxijumulop.epizy.com/75932727709.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/indian_cookbook_author_madhur_jaffrey.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93d54217-8557-40c9-9197-7800090ada37/the_little_shack_menu_el_paso.pdfIn PDF document text
    • http://ziboporo.epizy.com/tiserofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa1095db-c863-4310-87f4-c324ca26b55b/homelite_2700_psi_pressure_washer_honda_engine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/566ab306-9d5f-448f-b033-3326e8c9e358/how_to_write_a_novel_introduction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b381c18e-1c68-4e7d-b032-f026aaa93ea9/80597777989.pdfIn PDF document text
    • http://ratobewiwigu.atwebpages.com/xibetibig.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/18331044594.pdfIn PDF document text
    • http://pekoguwomigurup.epizy.com/entrance_counseling_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/formal_dinner_party_invitation_template.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_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 5468 bytes
SHA-256: e539fe74d61b430d843885ab9172d63bb7094f6acb5ede19bda88e33721ad7d2
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 10712 bytes
SHA-256: d6783211db941776fd67719b92b3b4b736121a4d8f8610ea62eb4cda48c43389

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