Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7de0909a0ac9203…

MALICIOUS

PDF

77.8 KB Created: 2021-04-06 10:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8dee32af08ac7d57bb286742d8d5949b SHA-1: 004cd92286eeb3d0f6b9a3d2523132b9838d4755 SHA-256: b7de0909a0ac92035696208335476aebadaae33b83a2ff323e17ff864018a430
134 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan attempt. The document functions as a link farm, presenting numerous URLs disguised as download links for various content, including academic reports and song downloads. The primary malicious URL identified is https://midufefew.ru/123?utm_term=aashiqui+2+all+song++wapking.+cc, which likely serves as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/123?utm_term=aashiqui+2+all+song++wapking.+cc PDF link annotation
    • http://lifolibi.sportsontheweb.net/how_to_do_a_lab_report_for_physics.pdfIn PDF document text
    • http://devedilazabu.medianewsonline.com/30607457040.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/93843586651.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/acid_base_and_salt_notes.pdfIn PDF document text
    • http://lologunaw.mygamesonline.org/low_histamine_anti_inflammatory_diet.pdfIn PDF document text
    • https://cdn.sqhk.co/menidume/fwhgjjZ/bheem_cartoon_video_2019.pdfIn PDF document text
    • http://farunoraxukiz.getenjoyment.net/dafitowabupinagat.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/31967627501.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopijaku/iqcjet0/company_profile_format_word_document.pdfIn PDF document text
    • https://cdn.sqhk.co/puwetudul/iRIhhhf/modaxodowozewewefesa.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/4093573e-bf13-4103-bc7f-666585347075/giworelotovugava.pdfIn PDF document text
    • http://dexadusoxeb.atwebpages.com/mokamaxawupozorobukuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9150e7c-e440-43dd-8cb4-c8ecf150884c/51549024297.pdfIn PDF document text
    • http://najukelosuned.myartsonline.com/90608770826.pdfIn PDF document text
    • http://kijonag.onlinewebshop.net/popotoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f96b25f7-7640-463e-b3a2-228013aaa549/sample_powerpoint_presentation_for_academic_job_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8993908e-dcdb-41f4-a701-a14407265fab/why_you_should_save_your_virginity_until_marriage.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/nupujozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a238052-d90f-454d-9299-c298cbab95f3/rhetorical_question_in_a_sentence.pdfIn PDF document text
    • http://molujafit.atwebpages.com/cae_exam_vk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf397865-1f55-41a7-8812-bb100ce2d547/58201304142.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_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 5536 bytes
SHA-256: f7b93617455f96b8b5e4afec134a0e0c224f960150a40db5e401248e45f9a185
font_01_sfnt_off00010534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10534 10752 bytes
SHA-256: 836614ea51017edff1aa0d76a543e49c62873346d54f052a6faee6f11e4c19bd