Malicious PDF — malware analysis report

Static analysis result for SHA-256 a347add8ed32a877…

MALICIOUS

PDF

106.5 KB Created: 2021-03-27 10:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 25dd9201cb6d41ab0d7358237223476c SHA-1: a3af6bb3ee085a18a9ca42983a63e7287b4590c6 SHA-256: a347add8ed32a8776dfa479d91eee1e93725e15d0b74ea0528be7a08fd05056a
134 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or trojan delivery. The document body, though heavily obfuscated, contains references to 'Aspen hysys v8. 8 tutorial pdf' and 'wkhtmltopdf', likely a lure to entice users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/award?keyword=aspen+hysys+v8.+8+tutorial+pdf PDF link annotation
    • http://itwow.info/46431106796qif6s.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/quote_from_the_little_prince_about_stars.pdfIn PDF document text
    • http://nujijaj.getenjoyment.net/lijuwusivotaretemiki.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/example_of_application_letter_for_teacher.pdfIn PDF document text
    • http://aazzzry.space/social_phobia_testntdio.pdfIn PDF document text
    • http://pegijegur.mygamesonline.org/78332375785.pdfIn PDF document text
    • http://gazedalepi.sportsontheweb.net/reading_and_writing_chinese.pdfIn PDF document text
    • http://midunetojonawiw.mywebcommunity.org/agenda_examples_for_staff_meetings.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xogerakakirabip.epizy.com/lirurigorutarufebewa.pdfIn PDF document text
    • http://wuparol.epizy.com/pififikabexobu.pdfIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_49c7fd5a654e4ed997bbf14b8e6e36a5.pdf?index=trueIn PDF document text
    • http://jitawidavez.atwebpages.com/89731671707.pdfIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_9ecb7132c44c4aca872ec2be3cc9d251.pdf?index=trueIn PDF document text
    • http://natizat.epizy.com/installment_payment_agreement_form.pdfIn PDF document text
    • http://bexukavibume.myartsonline.com/65904145757.pdfIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_83b3ef5fe6c84a72b42c419fe8921746.pdf?index=trueIn PDF document text
    • http://bomemab.epizy.com/spotify_premium_apk_september_2019.pdfIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_bcbcea0847544456880700ac355644bd.pdf?index=trueIn PDF document text
    • http://gixulomo.rf.gd/ladodi.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_off000157db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DB 5508 bytes
SHA-256: 6854a7360c11ada098a61e90862e0de0fa4ffc8050d6897fed6d37881b973ce1
font_01_sfnt_off00016aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA7 15384 bytes
SHA-256: da1f0356bf85c77af8d3988b3224776e84ce2d37d8759a59ab26778c4a643fe0

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