Malicious PDF — malware analysis report

Static analysis result for SHA-256 cefe5cf485ba3a65…

MALICIOUS

PDF

110.3 KB Created: 2021-04-19 06:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c3c536521420e92d0dc9a8403adbe996 SHA-1: ce9c6f3f11e2367a1de7d9691019bfd669590efa SHA-256: cefe5cf485ba3a6524d835f90422b1ac1dffaaf0c9b2d122d902e4b2b25ffefd
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 0.9998

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://jacksth.ru/strik?utm_term=haier+mini+fridge+4.5+walmart PDF link annotation
    • http://fdvsefwfrw.space/parallel_structure_worksheet_with_answer_keyop1ra.pdfIn PDF document text
    • http://axecheat8.xyz/how_to_use_oregon_scientific_thermometer7kb18.pdfIn PDF document text
    • http://meetdouche.xyz/captivity_meaning_in_tamilq33hc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368741/normal_603e045c14caf.pdfIn PDF document text
    • http://helplnstagram-confirm.com/83743147576aobvh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425507/normal_600f90356f93d.pdfIn PDF document text
    • http://universityru.fun/168114561175fw0j.pdfIn PDF document text
    • http://claire-irk.ru/kennedy_center_millennium_stage_performance_schedulek24p7.pdfIn PDF document text
    • http://plafond.xyz/arnold_clarinet_sonatina5978r.pdfIn PDF document text
    • http://magnifioco.site/41494957957904bq.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/how_to_choose_a_baseball_bat_for_high_schoollmhig.pdfIn PDF document text
    • http://giveaway2020.info/mamarigonataxusopuxafoniaxbsh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koriguno.rf.gd/atualizao_android_lg_k10_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e00dc1fa-8f65-4690-9cd1-773ed4a4e2d8/the_school_for_good_and_evil_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/675ecba8-be0e-492d-9271-4ee94bb2a892/1221551085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a66d961-cc05-45be-9463-d36faf23041c/what_ivy_league_schools_offer_online_degrees.pdfIn PDF document text
    • http://fiwemigusa.rf.gd/zufetegaviwavoxutokonav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf544fef-adb8-4d06-bbd4-ec569212a2e8/everstart_jump_starter_1200_amps_manual_en_espaol.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_off000170a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170A8 5344 bytes
SHA-256: 358c418fd0b3c2e3f975d87c114f6c888c9f4c19ea833fba9e7edec3ae138865
font_01_sfnt_off000182e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182E2 12432 bytes
SHA-256: 5139da1bed4ed4eb5e5a70f4c2c2efffa12f48591c4ce4e22c82292e27d72ad0

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