Malicious PDF — malware analysis report

Static analysis result for SHA-256 9451b57db7cdc85c…

MALICIOUS

PDF

90.0 KB Created: 2021-02-24 20:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5aa3982003b0bd7e16c7479b9662b591 SHA-1: 9519ce775eb8003eb9b7264592ac7a2d05677b4a SHA-256: 9451b57db7cdc85c787084f78198f8fda7d4802b50798f2903a0285fad05e50a
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 0.9998

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://druttle.ru/123?utm_term=how+to+fix+white+knight+tumble+dryer+door+catch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387411/normal_601dbb3f9ca87.pdfIn PDF document text
    • http://dayzcommunity.info/93689227465m7076.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/1.garmin_nuvi_2597lmt_vehicle_gps.pdfIn PDF document text
    • http://supermagazforsale1.xyz/how_to_reset_the_password_on_a_nextbook_tabletnydx6.pdfIn PDF document text
    • http://joy-todays.online/36805772481w2jmo.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/garmin_vivofit_3_reset_after_battery_replacement.pdfIn PDF document text
    • http://avbox.org/vopopirugulabotafopipofa0os7v.pdfIn PDF document text
    • http://tubujek.iblogger.org/33260419966.pdfIn PDF document text
    • http://sefesipodaj.22web.org/bifomuduwukuba.pdfIn PDF document text
    • http://doluridibulif.iblogger.org/xitutebeboware.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/bipusisonaraloregepudi.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/waler.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://potimafekun.epizy.com/735432399.pdfIn PDF document text
    • http://mizuvawilukilel.rf.gd/fox_news_13_reporters.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/aarakshan_movie_hd_video_song.pdfIn PDF document text
    • http://guzadexogemadev.rf.gd/nikon_d5200_camera_price_list.pdfIn PDF document text
    • http://solujenujaki.epizy.com/hindustan_petroleum_corporation_limited_balance_sheet.pdfIn PDF document text
    • http://gefifeji.rf.gd/38368377624.pdfIn PDF document text
    • http://funolowudako.epizy.com/acca_examiner_report_september_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/patitubevugebasobopenepe.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_off00011f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F67 5684 bytes
SHA-256: 220309bf08f8534e6b660af727cc1b6554dc07fb830542f6c022c2a806c5850c
font_01_sfnt_off000132b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B2 11748 bytes
SHA-256: e9eca318e18563d40d491cfc1941b19b305bfa6e06e365469e849e95af6b1b0b