Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaac75eb363d7253…

MALICIOUS

PDF

76.7 KB Created: 2021-03-18 03:57:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 710bb2c88c620b825b5b76afd5263fbf SHA-1: ee790e3fb343ff0daaec46788bca8cf3ecd8bffa SHA-256: aaac75eb363d725310232904c9e2e202927e5ea14f5d0e8b01e9778b23f2019a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://botokaw.ru/123?utm_term=report+a+crime+anonymously+scotland PDF link annotation
    • https://cdn.sqhk.co/vopofuxo/gwIiujD/rekilisikikudisu.pdfIn PDF document text
    • https://xelewutoritawi.weebly.com/uploads/1/3/1/0/131070131/likegeguw.pdfIn PDF document text
    • https://cdn.sqhk.co/xobevopu/figUsvG/mytouchsmart_timer_model_26892.pdfIn PDF document text
    • https://cdn.sqhk.co/vubiwete/aSoVP3M/fetupubonujiganazabikev.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/cfYA7WI/sound_editing_app_for_mac.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/dusopegudiretu.pdfIn PDF document text
    • http://kogowetek.getenjoyment.net/state_trait_anxiety_inventory_test.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/T24IDJk/tuning_motorcycle_helmet.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/gezoxekujib.pdfIn PDF document text
    • https://zageporipemaza.weebly.com/uploads/1/3/4/5/134507549/nabam-xabegu-puxovawim.pdfIn PDF document text
    • https://deledixedebudon.weebly.com/uploads/1/3/4/4/134499708/43c4ec9a15.pdfIn PDF document text
    • https://lurusinobafor.weebly.com/uploads/1/3/2/7/132710654/85027.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/532c841e-8c09-4e82-bd99-1d44c404d600/78936689674.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/abu_dhabi_police_logo_guidelines.pdfIn PDF document text
    • http://zuvuzevo.atwebpages.com/business_analyst_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/nopotevowawosadoletit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159132ad-007a-412d-9554-0c10bdaaed74/19057631102.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/idioms_worksheets_for_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/form_6a_notice_to_quit_template.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/zezunirubasokagem.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/a_tutorial_introduction_to_bayesian_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c87dbd1-193e-4ac5-9fce-f6ef53f7cb98/in_the_heights_movie_uk_release.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_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 5328 bytes
SHA-256: 8536299a057adbc371d3b8b4c214c8a75c289c3fb2cfefee6c9ee4a4bf1b00ef
font_01_sfnt_off00010055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 10508 bytes
SHA-256: 2c5ea26651a817ffa52233d5a9fae0680f15de9d0cf8cb40d3cd57d407aed636