Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1efc181442cd5aa…

MALICIOUS

PDF

96.0 KB Created: 2021-02-18 19:07:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 678e4ab220f043caf6004447885cfb51 SHA-1: 08d65b5aa3ab22fdb6d0ea84f374aac9fdcd7602 SHA-256: b1efc181442cd5aa227b3e1ad4a6d37cf07fd01fa9c87a766cf48a760626a614
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malicious content delivery mechanism, likely initiated via spearphishing.

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 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.
  • 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://jottigo.ru/123?utm_term=where+did+they+film+sherlock+hound+of+the+baskervilles PDF link annotation
    • https://sofivowipaduru.weebly.com/uploads/1/3/4/4/134454637/rikozomodogon.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/kamoviliruzowo-gelegidubiwi-kixaguriribom.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/fthiaV3/3853145792.pdfIn PDF document text
    • https://nimekeboxiz.weebly.com/uploads/1/3/0/8/130873861/378126.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/jheLsje/10234838561.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369509/normal_5fdf7f0d34f96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456687/normal_600948ee39269.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/hiYijfu/73396950512.pdfIn PDF document text
    • http://zekinaperobivak.22web.org/edelweiss_login_report.pdfIn PDF document text
    • https://gabinabadebaxir.weebly.com/uploads/1/3/1/4/131408928/resijizowiros.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500001/normal_60160833981a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444864/normal_601a381faed28.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/aVQiigc/writers_assistant_jobs_los_angeles.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/xoguwavosuje/xumivuvadaso.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/30352719731.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/bangalore_days_songs_kuttyweb.pdfIn PDF document text
    • http://fixetofona.epizy.com/55421312649.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/vfr_cross_country_flight_plan_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/geometric_smoke_effect_motion_background_free.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_off000137f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F1 5640 bytes
SHA-256: 8b58f0c60a9adffa4c43ee2a3245ae0aed3ccde53878c9d8c112c00d06cc9e64
font_01_sfnt_off00014b14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B14 11124 bytes
SHA-256: 3f2a0cb771b2b9ebfdfd917cabb103901ef4e9192c93c772bdc5e85451daae76

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