Malicious PDF — malware analysis report

Static analysis result for SHA-256 14708d47caf4d1b6…

MALICIOUS

PDF

69.0 KB Created: 2021-03-22 15:16:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e11f38150db858b8a5294b4baec94780 SHA-1: c0b2642119b7556f7a223ea2b4b9476821209127 SHA-256: 14708d47caf4d1b6d8ab1036b8a0def43f055c474a32480b91bb9fe02da15f3c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URI heuristics suggest it's designed to redirect users to potentially malicious or unwanted content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://bologen.ru/wix?keyword=roller+coaster+energy+transformation+worksheet+answer+key PDF link annotation
    • http://xobukafa.iblogger.org/38323472453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385011/normal_60462d5f1f36e.pdfIn PDF document text
    • http://upsbox.ru/2904274494574wy4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462697/normal_6007e5c518f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393631/normal_6017bf7626a86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475725/normal_5fef3f152872f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_601476e921fe0.pdfIn PDF document text
    • https://xoludifatak.weebly.com/uploads/1/3/4/4/134477652/pupilarozef.pdfIn PDF document text
    • http://marketeuro.pro/the_exorcist_3_full_movie_download_480pno0u2.pdfIn PDF document text
    • http://tortomsk.ru/wefukijatexoy2lxv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377905/normal_5fe9ee40d3fe6.pdfIn PDF document text
    • https://lujiwosibe.weebly.com/uploads/1/3/4/0/134040634/mujopakapebip-jusukilezene.pdfIn PDF document text
    • http://cashthe.ru/audio-technica_at-lp120xusb-bk_direct-drive_turntable_analog__usbfdete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_603e279beac5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sasaroguri.rf.gd/actor_vijayakanth_photos.pdfIn PDF document text
    • http://rironedonigebi.epizy.com/259737716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b977bd7c-6137-403c-aaa4-91cd63904397/data_warehousing_and_data_mining_course_description.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd7ef15d-820c-46bc-95e9-efc7a4654666/samsung_hmx-f800_precio.pdfIn PDF document text
    • http://megutid.epizy.com/abrahaminte_santhathikal_movie_songs_320kbps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/764f5d1c-4809-4eab-8148-eb1c663be969/does_almond_milk_have_carrageenan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5060e1e3-0d7a-42e9-a37c-b4e0c3b4beb9/36819187769.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_off0000d236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD236 5560 bytes
SHA-256: a060720f127f079b6a199ce4265c129ae3be29982c9eb962a23c3455f192891a
font_01_sfnt_off0000e51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51D 9756 bytes
SHA-256: 24727d1b613b5d1d617ce81a2d21f0894868956118cfebca7101908c388e9085

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