Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d90fd8cc06cbc1…

MALICIOUS

PDF

78.9 KB Created: 2021-03-19 09:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 50b46c4916df45c819743a12329aca8c SHA-1: f274de72c3c5b4c5b051cdb6af853d44e527286c SHA-256: 19d90fd8cc06cbc1950093df340c37e2ae7d043606bafdeb59912f52f75fd956
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 0.9998

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://lozipotod.ru/wix?keyword=photoshop+free+crack+download+for+windows+10 PDF link annotation
    • http://postel-na-zakaz.ru/cuales_son_los_personajes_principales_de_la_gallina_degolladaqpvxz.pdfIn PDF document text
    • http://meetsoda.club/jixexibazuprdqx4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485436/normal_603c306d3b4f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_60501e452b566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_600af8f063d37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_6015589823cc4.pdfIn PDF document text
    • http://mangalvpodarok.ru/14420189352q5jg5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501777/normal_5fe10bd6077d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385647/normal_5ffd0cd12373d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406806/normal_603747765fe16.pdfIn PDF document text
    • http://starconflict-game.ru/can_you_buy_jitterbug_at_verizonq40hn.pdfIn PDF document text
    • http://circleshtang.xyz/where_does_like_water_for_chocolate_take_placeeeuf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445115/normal_600c531fcde64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453336/normal_5ff1edd9ba3c9.pdfIn PDF document text
    • http://trylait.pro/how_often_to_replace_kangen_water_filterq379j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_c3bb8894c74b441eb98a48ca01854a74.pdf?index=trueIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_fc8bd68b12f647bf83fe40f292cd418d.pdf?index=trueIn PDF document text
    • https://931f52e6-cb68-4a93-8e02-54808d33f8b6.filesusr.com/ugd/6290de_bff8219eb45d4c968452574e38f8e973.pdf?index=trueIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_919661cbbad3495f9c2016b4520e4a6c.pdf?index=trueIn 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_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 5592 bytes
SHA-256: 8cf3b520ff2b6e7cc8ffba2e7c61daa9213b187eb5de468efd0ef8b7f145ebf5
font_01_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 10192 bytes
SHA-256: 4e5c17e11c57252768547dc6362afc5425a56ea950b4f7e6fcc268c6168c7145

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