Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e39dcaa8f240f2…

MALICIOUS

PDF

90.5 KB Created: 2021-04-07 06:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4c12f8f35a185f0c793cdfe58260d615 SHA-1: d72584f8692f74e707b1ff73804286d7ae66b76a SHA-256: 12e39dcaa8f240f280c77b610dc94b91253d89681dde3f35e658101ef5150fe8
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, appears to be a lure related to an Azure ML tutorial, likely to entice clicks on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=microsoft+azure+machine+learning+tutorial+pdf PDF link annotation
    • https://jizojalagakamu.weebly.com/uploads/1/3/4/8/134886497/7709085.pdfIn PDF document text
    • https://zarozeginete.weebly.com/uploads/1/3/4/7/134708045/1372aa02005106.pdfIn PDF document text
    • http://xotekalulomeb.iblogger.org/zawanarowasezikipofo.pdfIn PDF document text
    • http://jovopomutulilo.medianewsonline.com/zozomobowizuxalakoxu.pdfIn PDF document text
    • http://jukekelexoseda.22web.org/darkest_dungeon_warrens_guide.pdfIn PDF document text
    • https://bebejumupetokox.weebly.com/uploads/1/3/4/5/134513190/6520972.pdfIn PDF document text
    • http://purefuko.22web.org/76393675116.pdfIn PDF document text
    • https://cdn.sqhk.co/bomaguvodar/ichiMYT/faustformel_reaktionsweg_100_km_h.pdfIn PDF document text
    • https://cdn.sqhk.co/dasofuduveje/Ljhdgii/check_kplc_bill_using_sms.pdfIn PDF document text
    • https://fojaxusulilunud.weebly.com/uploads/1/3/1/3/131381134/newopatuponuvifani.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/2789872.pdfIn PDF document text
    • https://githubIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavatesivo.myartsonline.com/tempat_download_light_novel_anime_bahasa_indonesia.pdfIn PDF document text
    • http://fafanuzumamowaz.epizy.com/chillicothe_il_police_reports.pdfIn PDF document text
    • http://jatugeset.atwebpages.com/fitbit_versa_lite_smart_fitness_watch_lilac_silver.pdfIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_5abff382365b4b419303d1253c05c723.pdf?index=trueIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_b5b63707c9a24426b81c202e84e40b33.pdf?index=trueIn PDF document text
    • http://mevonaku.rf.gd/funny_child_video_song.pdfIn PDF document text
    • https://66166ed5-207d-48ad-a5ac-83b7e977862f.filesusr.com/ugd/0d0d42_bcf1e1d2391c455a86b698aafbb24303.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_off0001237d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237D 5624 bytes
SHA-256: a9515d57209e0f4321db7103b534acbb243db7d60a972dec380bf1489b8bd245
font_01_sfnt_off00013688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13688 11272 bytes
SHA-256: 17e911c61c5494fe8859ea3cc943acd8876c16edfa2acb9ae2898a1cca28825a

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