Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d844edba8289a92…

MALICIOUS

PDF

80.9 KB Created: 2021-04-09 09:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 837dff302eb2d5433e61e08880589b4b SHA-1: 9328ccbf8ac230a3f5fb7c139e2812fc09658c62 SHA-256: 2d844edba8289a9218f65f927287c7e8f9e8d66a9e7ab5b08558a9b10c484932
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/strik?utm_term=what+is+the+most+popular+drink+ordered+at+starbucks PDF link annotation
    • https://pigabatanez.weebly.com/uploads/1/3/1/3/131380253/fe53e32be7000.pdfIn PDF document text
    • https://xoxilorimisutoz.weebly.com/uploads/1/3/4/7/134705863/wuromizutij.pdfIn PDF document text
    • https://cdn.sqhk.co/ratobomebal/kSigigY/zudixanakav.pdfIn PDF document text
    • http://gavediteriremuv.medianewsonline.com/catalogo_ngk_mexico.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/omron_evolv_upper_arm_reviews.pdfIn PDF document text
    • https://kegadurab.weebly.com/uploads/1/3/4/0/134096735/widatokizobawomo.pdfIn PDF document text
    • https://pawizujepus.weebly.com/uploads/1/3/1/6/131637171/0e355881c.pdfIn PDF document text
    • https://lijanitog.weebly.com/uploads/1/3/5/3/135309202/f6935f5f3be.pdfIn PDF document text
    • https://cdn.sqhk.co/lasumalena/giaiipj/torch_browser_free_for_windows_xp.pdfIn PDF document text
    • https://ramowukegi.weebly.com/uploads/1/3/4/5/134508735/reliruwunol.pdfIn PDF document text
    • https://gusobukenifoku.weebly.com/uploads/1/3/4/5/134525986/25fddb116001.pdfIn PDF document text
    • http://fogejebimo.scienceontheweb.net/zotajagonasi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/822c54fb-56b3-48e7-add1-8732bcea17de/9919334071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d61dcd6e-0508-41aa-a661-ce7a043774a6/computer_programming_courses_open_university.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b6c5d46-e0f7-406b-a036-2b6a4cfcf752/32519940117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24e7a157-0ba0-43ed-9323-78dee8419f6e/pulufexitagiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d01e96b-383d-414a-9150-b267a3075cfa/more_scary_stories_to_tell_in_the_dark_audiobook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f10155-4620-449a-b490-eb8c7112cca1/defemuxidafuresiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4b88acb-b504-4f39-b10a-c24b43899e7f/tusowotinamid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f69b486-962e-4022-be29-de07639d352c/what_age_is_oliver_in_call_me_by_your_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab1568f2-364a-40eb-98a1-094185818adc/vexulawewikizilinawejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03dfe1f3-c0f3-436a-a78a-1e276d494d56/80453346142.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_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 5528 bytes
SHA-256: c6ef5d3a43c163d62c6b2ab6dc9fa752b558dfb46e6d8a06e3d3265286723371
font_01_sfnt_off00010f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F59 11308 bytes
SHA-256: 84c550ce629c9725c30b441dc2f1a64a274bc481d0cafea1b6a1856dade9dff5