Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c07a54cf68ecd57…

MALICIOUS

PDF

76.8 KB Created: 2021-03-24 18:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4f85d327bf300dd4d34d3ea45606f57c SHA-1: 6a47280d673ae231d992d27532e9ef6e098358f5 SHA-256: 3c07a54cf68ecd57b51dc16ded3c39b4275eaca9dad2c6262858805f3731d070
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document contains a lure for remote support tools, instructing the user to install or connect with such software. It also functions as a link farm, directing users to numerous external URLs, one of which is a known malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate unauthorized remote access or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://nipisod.ru/strik?utm_term=how+to+use+a+whirlpool+accubake+oven PDF link annotation
    • https://cdn.sqhk.co/bebomopakax/uhbivek/healthcare_advertising_agencies_in_chicago.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/XgdjbOs/bloodsport_cast_imdb.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/7e9ggQV/real_car_parking_2_hack_ios.pdfIn PDF document text
    • http://legrand-spb.ru/sentry_safe_customer_service_numbernznup.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/romolopokapafizawenabdhq95.pdfIn PDF document text
    • https://cdn.sqhk.co/vafegijateno/qVahfgf/dantdm_trap_adventure_3.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/jbChaib/metal_slug_3_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/jiloduvunilu/iihyayM/clip_tiktok_b_m.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxarabo/hc54TrO/90_s_music_trivia_questions_and_answers_printable.pdfIn PDF document text
    • http://garderob-podolsk.ru/69662469312d8xf1.pdfIn PDF document text
    • https://cdn.sqhk.co/litojavu/jhCcvFa/76113709476.pdfIn PDF document text
    • https://cdn.sqhk.co/bimonabozo/ghaE1ie/zuwagumoketadorozipeweze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pusori/59317367293.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/rolesevexal.pdfIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_02bb4c2b58ff42f8bf37f133da45af23.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/xagenoboburibonisugapofow.pdfIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_2b1a993179994fa6b46ef664c814ba8f.pdf?index=trueIn PDF document text
    • https://80cb706b-a9cc-40e6-9cd2-ad5688d6c4a8.filesusr.com/ugd/c84a73_873a68a3fc764628a242043ec7850475.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomogas/sobopopimolifuparegideso.pdfIn PDF document text
    • https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_44a26e0d57364d858fd30b31acc8d604.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zedilegol/bokozerugoma.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/71726155835.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/mansions_of_madness_box_organizer.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_a1fb8e2789cc4d4586613c12a4c1d746.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_off0000ee72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 5336 bytes
SHA-256: e716eef2f6edfc741cf2307f625eadd5c42268e5c90910e09b1120f55f59aef2
font_01_sfnt_off000100a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A2 10796 bytes
SHA-256: 1ceff8934b720fc9418352b41288d87d1032659906ddd47e1ae858378927f2ee