Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b39f107fdb4d5ee…

MALICIOUS

PDF

76.3 KB Created: 2021-03-24 20:23:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 901acf063b03e97fc980a555b916c1d0 SHA-1: bdec7e1dfb8103bd52a5d3abc02d480732091652 SHA-256: 9b39f107fdb4d5eeb90098f9e65788c7b37af0b8c292ca99d4482c7ebaabab2a
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://baarspo.ru/strik?utm_term=dell+xps+420+motherboard+drivers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379744/normal_602865cddd30d.pdfIn PDF document text
    • http://situbune.iblogger.org/koplayer_android_emulator_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422640/normal_5ffa7fb99a08a.pdfIn PDF document text
    • https://nonesuwenuvav.weebly.com/uploads/1/3/4/4/134400251/2161474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454822/normal_6042ac9d0dd7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413228/normal_6024c53ed5a75.pdfIn PDF document text
    • http://muvajopumo.22web.org/46438975693.pdfIn PDF document text
    • https://bofakodejo.weebly.com/uploads/1/3/4/2/134265658/2637145.pdfIn PDF document text
    • http://pibosezegis.22web.org/brisingr_christopher_paolini_espaol.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/zusevamasor/sikimujunozajokoroboti.pdfIn PDF document text
    • http://nokebubikirog.rf.gd/business_communication_notes_bcom_1st_year.pdfIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_2c752a2e7b0849558042adb3c95c0950.pdf?index=trueIn PDF document text
    • https://6754c94d-8795-460a-880d-d127bb37d4d4.filesusr.com/ugd/2383dc_683c6afda69d451d8dca8f1ddc974175.pdf?index=trueIn PDF document text
    • http://lefabeku.epizy.com/tudokiwixa.pdfIn PDF document text
    • http://naxudafaxe.epizy.com/free_full_report_vin_check.pdfIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_530433bb68224f47b9a02a024aa750d3.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_419c8cf92361425494c45a3fb79cee1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wolina/homeostasis_reading_activity_answers.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_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 5828 bytes
SHA-256: 9aa0c9041e09e89a33fbf3b71eda646c7bd9832963c75a64e3afa4f07b9edda6
font_01_sfnt_off0000fe2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2E 11180 bytes
SHA-256: 242c6999d923531178a163161f84e05b4c5c3f99c9878acd92f6a1d92930036a

Open this report in the interactive analyzer, or submit your own file for analysis.