Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b5410036e49b1f…

MALICIOUS

PDF

73.3 KB Created: 2021-03-11 22:22:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 3663718a726dfe04f76b8af9d4f2e086 SHA-1: 59af369486e704b6ac545f4246d8ddb34683cabf SHA-256: a3b5410036e49b1f9e7fc0353325dc639f5f718f1f36f109007b06df95839e26
142 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically using an invoice or payment-related theme combined with a call-to-action to download a file. The presence of numerous external URIs pointing to disposable hosting and link farms, along with a high ML classifier score and ClamAV detection, strongly indicates malicious intent. The document likely serves as a delivery mechanism for further malware, potentially through the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://xezojetit.ru/123?utm_term=project+dashboard+excel+template+xls PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4492901/normal_5fe534d1f304e.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/LmLibJx/jeluguzojexuvesuf.pdfIn PDF document text
    • https://cdn.sqhk.co/wesegagage/b6ziaoE/tip_button_on_apple_watch_calculator.pdfIn PDF document text
    • https://cdn.sqhk.co/bujerinalo/j3ghFij/block_puzzle_app_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421218/normal_5fedc741bb9aa.pdfIn PDF document text
    • https://cdn.sqhk.co/pipoxodul/huu1jgj/kerifovuwevigeneb.pdfIn PDF document text
    • http://reduslim-ufficiale.website/zee_tv_serial_punar_vivah_songs_down2b7wn.pdfIn PDF document text
    • https://cdn.sqhk.co/zotevokep/jeAijNJ/fisefizamajober.pdfIn PDF document text
    • http://biweekamnf.com/66881220812otwi7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_5fd3850ae0ab7.pdfIn PDF document text
    • https://cdn.sqhk.co/zetobazox/0r6gjQK/tom_and_lorenzo_mad_style_season_1.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/vowidewyy60m.pdfIn PDF document text
    • http://jelesanu.iblogger.org/bukidivolen.pdfIn PDF document text
    • https://cdn.sqhk.co/tevimuwijile/Gmid7hf/rome_total_war_barbarian_invasion_religion_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/cjhbhdY/revexeje.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/xisefowu/miluraka.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/nazotulijibutu.pdfIn PDF document text
    • http://zogemidagubaro.epizy.com/76644711296.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/xejaterixobiwu.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_off0000e1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 5600 bytes
SHA-256: b306833da59cf332e625a85255ba1587c153ff7c4e75187b0e8dd41127585c21
font_01_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 10268 bytes
SHA-256: 657f3d6e9b3ddfcdbaf20cd6737fd78ed1fc0773fea41093588ddbd1304cd9fd

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