Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d837a8c55301bb…

MALICIOUS

PDF

79.9 KB Created: 2021-04-11 16:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 341c1e9a25dcf2f04c5dae8e7664ecca SHA-1: b3b0112faa7389b4edbe6d796b15ba042de320ae SHA-256: 15d837a8c55301bbef8b7d2afdcc4d0be21b5c6ce01f45580373a020f35f2cac
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely used as a lure to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/strik?utm_term=wilderness+first+aid+class+bay+area PDF link annotation
    • http://noxaduva.mypressonline.com/ahsanul_qawaid_free_download.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/color_pencil_drawing_techniques_step_by_step.pdfIn PDF document text
    • http://gixodugesu.medianewsonline.com/47778995502.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/likemajosa.pdfIn PDF document text
    • http://kezijumedet.mypressonline.com/spielplan_bayern_mnchen_2020_18.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/aXgfuJj/4_pics_1_word_red_carpet_photographers_statue.pdfIn PDF document text
    • https://cdn.sqhk.co/dufimogemeka/rghicKc/11363491756.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/galileo_sidereus_nuncius.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/15adcf7a-90a4-4d49-87c8-a8a34560b365/whats_the_difference_between_cat_and_dog_hair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8581add3-767a-4d89-ab8f-f455e0221c55/does_costco_have_a_hearing_center.pdfIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_2b400df236b14a16a406f270f7d70a43.pdf?index=trueIn PDF document text
    • https://33da92c3-26de-4f6b-bf12-1693cb6a6e79.filesusr.com/ugd/0307f2_0cb8dda746f841fb83bff26883fb25e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f316141-07c5-4217-b778-07bc263f89a8/dazufuzosulubamujurezug.pdfIn PDF document text
    • http://xowilewegiwo.myartsonline.com/sedimipusiwoxozol.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_a716eeb47503409199ec0f740c933330.pdf?index=trueIn PDF document text
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_d5afb9108d71484fbee48b4abb132f3b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84fff675-c20c-4226-bd94-1c98ee50bdf7/in_the_mood_lyrics_24kgoldn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e459e1-6e84-498b-85c2-e2bb1659af4e/whats_happening_at_the_capitol_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57aded64-4017-4836-91c2-e760c621361e/vivulitejeniguduwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcf71298-db59-4d6a-8e8b-4d30dbcc28b7/12721000635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac6aaf99-21e6-4687-9840-baf4b8b90db4/77865663865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99d38681-39e8-4757-9fe1-333f590a0328/alpine_cda_105_auxiliary_input.pdfIn PDF document text
    • http://zijiwaras.onlinewebshop.net/what_is_a_good_beginners_wine.pdfIn PDF document text
    • http://nakixaxev.myartsonline.com/bibliography_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a562e8-7941-410d-af55-7e66351ad51f/this_bridge_called_my_back_publisher.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_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 5268 bytes
SHA-256: ab2bb3e4adcafb9f478396dabf9bfd4e73334f0b539939bf798f33c997e84f8d
font_01_sfnt_off00010b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B41 11332 bytes
SHA-256: eb208698744972d69da05ffdf014e5bb38fcae56241ed368ccb334ee71e47e2b