Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d409e25a47bf5b…

MALICIOUS

PDF

77.1 KB Created: 2021-04-16 22:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d663000bec934e37cb2fe4061da4094c SHA-1: 1bbb57cf5a00c41228e9bf0b1610989b8dacad3f SHA-256: a1d409e25a47bf5b668a9ebf362185e92e04761aa3eb2f707f4d6d6325ccd96e
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to a URL that appears to be a redirector for a download lure related to 'adobe premiere pro tutorial download free'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple PDF files, suggesting a malicious distribution campaign. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/strik?utm_term=adobe+premiere+pro+tutorial+download+free PDF link annotation
    • https://jebunofom.weebly.com/uploads/1/3/4/4/134468214/vawixalumaf-zidido-baranubamoxej-wevibemuki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408335/normal_6020aea1b4a8a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457577/normal_5ff65c685e639.pdfIn PDF document text
    • https://vimugowome.weebly.com/uploads/1/3/4/3/134323071/1afeb.pdfIn PDF document text
    • https://dadojunolibete.weebly.com/uploads/1/3/2/6/132683289/461a9.pdfIn PDF document text
    • https://janusizexagelu.weebly.com/uploads/1/3/5/3/135337128/dibar.pdfIn PDF document text
    • https://kigokevorusom.weebly.com/uploads/1/3/4/7/134709893/tinujasip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416792/normal_606409a9d4fdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472484/normal_5fd876b961074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_6053027f1bdca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mirowoke.rf.gd/mifubatanetexofu.pdfIn PDF document text
    • http://xojodoruxima.epizy.com/31976278969.pdfIn PDF document text
    • http://lagunuriteg.rf.gd/45194401806.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/apa_ethics_code_forensic_psychologists.pdfIn PDF document text
    • http://loluwoje.epizy.com/tarapuvopazopisevazemaxer.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/cebuano_bible_offline.pdfIn PDF document text
    • http://nedeponup.rf.gd/livros_de_psicologia_comportamental_para_iniciantes.pdfIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_4cb4a2ab45684ef5aee930c8e9d58555.pdf?index=trueIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_8581f3c39ee9482caffe019f5d08d991.pdf?index=trueIn PDF document text
    • http://marakolin.epizy.com/sasarevivigeba.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_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 5228 bytes
SHA-256: fe1efd0202923442199f85fa5bc3c0493ad4d2bbd2c2b39eda0efdfa7725d7ff
font_01_sfnt_off00010385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 10340 bytes
SHA-256: f9b6f56240acb4d2aa43307176a15bc3102090b1181e9879dcdd0bdd79cd6476

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