Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3c79e484014a8e…

MALICIOUS

PDF

74.5 KB Created: 2021-04-01 16:23:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 251552f98be46f947a745ac9efcb18e7 SHA-1: 9ac9ecf6f2dc92a61ee9c6b6072df2f582264368 SHA-256: dd3c79e484014a8eeb7806592294f258f9730ba1f439e1c7465fa57f0befeacc
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-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://gimoguvi.ru/award?keyword=big+ideas+math+geometry+online+textbook+pdf PDF link annotation
    • http://gojevomarokabe.getenjoyment.net/52468001570.pdfIn PDF document text
    • http://bezufosaga.iblogger.org/free_printable_adjectives_worksheets_for_1st_grade.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/rhyming_words_for_freestyle.pdfIn PDF document text
    • http://texifudosino.mygamesonline.org/gexiremovafilopidojija.pdfIn PDF document text
    • http://gevenukodujojov.getenjoyment.net/aptitude_test_questions_and_answers_for_software_companies.pdfIn PDF document text
    • http://geforiro.scienceontheweb.net/25573444071.pdfIn PDF document text
    • http://vonexalux.sportsontheweb.net/65207261300.pdfIn PDF document text
    • http://fonivoguko.medianewsonline.com/82614391459.pdfIn PDF document text
    • http://subumobo.22web.org/all_commands_for_command_prompt.pdfIn PDF document text
    • http://rikafitamedad.medianewsonline.com/77418912427.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://furipurisebete.onlinewebshop.net/breezin_chords.pdfIn PDF document text
    • http://lekakosepubu.rf.gd/emulator_8086_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddc5555a-8af9-447e-a718-6192abe3b396/48178981767.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/big_little_farmer_mod_apk_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb4ea8f6-120b-45df-ace4-754c7f19061d/how_to_improve_your_social_skills_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea4f23cf-7e23-4f95-bfd7-c04eb4ca6f38/where_did_african_swine_flu_come_from.pdfIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/gubumudagokevojunix.pdfIn PDF document text
    • http://turuduje.epizy.com/pioneer_elite_pro_507pu_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zizene/classic_wow_engineer_leveling_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7901c1d-46de-4c3a-a497-d7928f6c6fea/xobakowekas.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_off0000e445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE445 5880 bytes
SHA-256: 1e90e00ed45911eaa89b6906de54fa73d684f0dff84cb5683253892550b566a0
font_01_sfnt_off0000f82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 10724 bytes
SHA-256: 5df6132df9a20730e426abbd7f03a6ed7e4006912ab2be50045b7ee9d5ff5f08

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