Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9708d7ad2141340…

MALICIOUS

PDF

72.1 KB Created: 2021-02-12 14:09:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 01402ecdfb4b87c7a460a2bad4d68e50 SHA-1: ec7218c16192bb2571690c8438f31d13fe5472fd SHA-256: f9708d7ad214134034ab46a2655b99faedc03dc5adc1e23aa941d1d4d5dcb84a
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/wix?keyword=manual+for+apple+tv+4k+remote PDF link annotation
    • https://cdn.sqhk.co/zidexamuwela/hiSSihM/faxurabutota.pdfIn PDF document text
    • http://esclick.pro/028_stihl_superxkb10.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/acQWji8/air_jordan_4_retro_premium_pinnacle_snakeskin.pdfIn PDF document text
    • https://bajarewejewud.weebly.com/uploads/1/3/4/6/134673735/700b4a36cb09.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/7094568.pdfIn PDF document text
    • https://nosovaranipad.weebly.com/uploads/1/3/4/7/134743093/vezetaz.pdfIn PDF document text
    • https://dazarurizupe.weebly.com/uploads/1/3/1/1/131164120/xamamolekopireba.pdfIn PDF document text
    • https://mowasevibipogo.weebly.com/uploads/1/3/1/3/131379904/2020374.pdfIn PDF document text
    • http://korecos.ru/contagion_streaming_vostfr2c2fr.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/jh2HhgC/flights_to_las_vegas_from_lax.pdfIn PDF document text
    • https://cdn.sqhk.co/naboxolat/hajidRe/20553598452.pdfIn PDF document text
    • http://vuvefezod.iblogger.org/annual_report_bca_finance_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/RHi1vii/harvard_business_review_subscription_student_price.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/xovekolamoxe/lagu_batak_simalungun_elvi.pdfIn PDF document text
    • http://belavujelu.epizy.com/10483203947.pdfIn PDF document text
    • http://futebupolidasuk.epizy.com/league_championship_series_format.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/zukajazizate.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_off0000de1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 5084 bytes
SHA-256: 16fa27e98e376ead5458c3cdae27cc1243ccad2f72120baf1c3ba81a8faddc70
font_01_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 10576 bytes
SHA-256: 41328a7b47ff2b163429cfb7049e383817d7d81b4c21e570cb6f693e13584d5a

Open this report in the interactive analyzer, or submit your own file for analysis.