Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b5bbb7e6a2ab70…

MALICIOUS

PDF

90.2 KB Created: 2021-02-17 23:04:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3b9bd0a8de1b29b907abdf1584cf4d01 SHA-1: b31d86f1e3512977b44125f5d08300bcb5d81b39 SHA-256: e1b5bbb7e6a2ab7049fdbff139e05ebc20c5189675d8a1ff2b5ba2dcf0a61d92
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common technique for SEO manipulation or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful sites.

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://leonvi.ru/123?utm_term=v+for+vendetta+covid+mask+uk PDF link annotation
    • https://cdn.sqhk.co/gukitane/ggieUje/77130550216.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/Zjazybj/total_e-_wallet_pay_for_fuel_with_paypal.pdfIn PDF document text
    • https://kupujusurigov.weebly.com/uploads/1/3/4/4/134471221/5030142.pdfIn PDF document text
    • https://cdn.sqhk.co/fefoseto/l5SjgC5/pound_cake_recipes_from_scratch.pdfIn PDF document text
    • https://cdn.sqhk.co/verexoleki/0bjalmH/40139330833.pdfIn PDF document text
    • http://fixmarker.fun/unicode_to_krutidev_converter_software_freej0bfa.pdfIn PDF document text
    • https://xuvelufuxilo.weebly.com/uploads/1/3/5/3/135387868/2046065.pdfIn PDF document text
    • https://ligegumipiwefu.weebly.com/uploads/1/3/3/9/133999845/5146478.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/ifigTmb/dekuxiropagizuvesapu.pdfIn PDF document text
    • https://kolofajek.weebly.com/uploads/1/3/0/9/130969684/3063765.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/ghgjKje/warship_craft_yamato.pdfIn PDF document text
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/6510ea9.pdfIn PDF document text
    • https://cdn.sqhk.co/sawowudin/Zhg18ij/sago_mini_village.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wozowuledij/aplikasi_al_quran_indonesia_pc.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013146.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13146 18256 bytes
SHA-256: 93f888a6f914366ce446447bf18390c08e6e91e1b9b6d170a813082372063b94
font_00_sfnt_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 5108 bytes
SHA-256: c5d90dc1fc1e66f880aaf3b2d0170bf80298274e311a140a3ea77701e530da4e
font_01_sfnt_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 11140 bytes
SHA-256: bbee330b1c46ece8ff3fd6bb5992323cde23ed6a458717d6fafbd91fd1280ad8
font_03_sfnt_off00014d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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