Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72871366404a67a…

MALICIOUS

PDF

78.1 KB Created: 2021-03-08 10:37:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c2262efaf4fc98cadb490688c53c31f1 SHA-1: 2ced5032705f7d53b9912c1c4606ddc3ce66470f SHA-256: b72871366404a67a5a45e7eba5a153a0a8b6a1572ee87332e0debc4a4301bd1e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/wix?keyword=my+big+campus+shutting+down PDF link annotation
    • http://tonagruz.ru/4651243355918wfz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417313/normal_5fc9ffae8f991.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427544/normal_6027efcf8d67f.pdfIn PDF document text
    • http://purpless.vip/fosanisoigq5.pdfIn PDF document text
    • http://fobimuwoxik.iblogger.org/60922689228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457620/normal_60456530209dd.pdfIn PDF document text
    • http://manaxupupili.iblogger.org/41515965912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380088/normal_5fdab76bf0b94.pdfIn PDF document text
    • http://wekeb.space/jupesuxakozitenivilapeporo7ak.pdfIn PDF document text
    • http://teaitalis.space/betoboxojusab2kuop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_602545c74b7ff.pdfIn PDF document text
    • http://vilopeg.xyz/weezer_island_in_the_sunyf2o8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375195/normal_601abd84d41c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479470/normal_60043ce057403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_5fdc65a7063fb.pdfIn PDF document text
    • http://zorugukuremired.22web.org/how_to_reset_belkin_router_after_power_outage.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b07771-1f76-4855-8717-432cdfa3c07e/reset_saeco_odea_giro_plus.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_52bafc702e2643d5a41078ef4fc4e53d.pdf?index=trueIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_8d1310ae21294ec19ed0a457d47150df.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_5d1a47cd48324be8aed4b7b121e884e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad9adfc-4eac-4e67-a56b-aaf64ce97337/how_to_set_up_a_volunteer_organization.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ca1935-3326-4d56-a50d-dd5d2884e999/hebe_tien_a_little_happiness.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_off0000f1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 5696 bytes
SHA-256: bb36bcb8442b575d98dec5b08dc08582a600bae03017959d0b155acc3b76a5a1
font_01_sfnt_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 11072 bytes
SHA-256: de543748d236f0bafe5940f58148e08697c53f99bd3a9cb49920e82fd1e4194d

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