Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d5778bf735ced6…

MALICIOUS

PDF

80.2 KB Created: 2021-04-25 13:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9ddfd0bbdbbfd84a6d4b6f17f8994228 SHA-1: 5401bd82630772fa97d625a46fa180b111f236d6 SHA-256: 51d5778bf735ced6ded5da05be863bbd4d598fb060cac463f11ee99824ffce76
126 Risk Score

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 0.9964

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://fokemale.ru/strik?utm_term=1769-l33er+datasheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447658/normal_605529964224b.pdfIn PDF document text
    • https://cdn.sqhk.co/zamokaxu/0ihHJif/world_hockey_juniors_2020_tv_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/baxusowuripo/ZFjjibo/wuvutetelomisoxubupivozik.pdfIn PDF document text
    • http://vanlit.ru/60233757598kydhj.pdfIn PDF document text
    • https://bakigimos.weebly.com/uploads/1/3/4/3/134322269/nusebodajexi_mikunabe_mabuxitudab_lovomutawijol.pdfIn PDF document text
    • http://tonerinkstore.com/2360148153975v6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486367/normal_6054e67285ec3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426059/normal_606da4bd38d8e.pdfIn PDF document text
    • https://cdn.sqhk.co/wazotifuk/icHidgI/coin_collection_storage_books.pdfIn PDF document text
    • https://tunibedexorole.weebly.com/uploads/1/3/5/3/135350281/watitigokulu.pdfIn PDF document text
    • https://cdn.sqhk.co/ninubisidire/gfieWhi/cool_paper_origami_weapons.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403676/normal_60081e5fd7559.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/Y2MiAjh/editorial_format_example_tagalog.pdfIn PDF document text
    • http://sollabs.xyz/singer_6235_partsrrlqf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_601f769b4cf76.pdfIn PDF document text
    • http://momentikshop.space/74238811819o6o3b.pdfIn PDF document text
    • https://sifivuvowebi.weebly.com/uploads/1/3/4/3/134316435/mowufe.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/9119523.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_90602f372ca14472831438998e7622ad.pdf?index=trueIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_08d630f71c484d99889ba3371e173223.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/bobrick_b-_221.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/1446914637.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/love_story_movie_song_mp3_download_pagalworld.pdfIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_4091a8376d9a47138d940ce142ec5d46.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/posufij/72846235672.pdfIn PDF document text
    • https://a3c73713-be4b-4c8d-a01f-dab92ecb4e1a.filesusr.com/ugd/5df860_78b5db184e254def9c813b28083f6cb3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/24555047503.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_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 5672 bytes
SHA-256: 3ea4b13f40393bdcb9b1d38aa086b1b693d01ef77d1cbb5a60990ed3982da2d3
font_01_sfnt_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 11864 bytes
SHA-256: d6ee81af79fcab3d0004a034edee479867dda00daf5a136136525a017651e92c