Malicious PDF — malware analysis report

Static analysis result for SHA-256 6572b2683638b866…

MALICIOUS

PDF

77.7 KB Created: 2021-05-10 02:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 01072e1ee7f348668b61c478e3a09000 SHA-1: c98cee5c10b47b969487ae63cd6846c44c773b0c SHA-256: 6572b2683638b866938f19fde9477b97db8e101cd6b8cf98fc7155fa00c8a281
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The presence of 'utm_term' in one URL suggests tracking or redirection. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to SEO manipulation or directing users to malicious content. The ML classifier and ClamAV detection further support a malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nipisod.ru/strik?utm_term=what+is+curse+of+strahd PDF link annotation
    • http://visetazide.medianewsonline.com/business_management_free_download.pdfIn PDF document text
    • http://juligum.22web.org/90934985876.pdfIn PDF document text
    • http://maxoranano.sportsontheweb.net/draft_watermark_foxit.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/C82ibTM/83321293212.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/92487732937.pdfIn PDF document text
    • https://cdn.sqhk.co/pakiwujipubi/icjciiP/consolidated_theatres_pearlridge_events.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/how_to_fix_a_water_cooler_that_doesnt_cool.pdfIn PDF document text
    • https://cdn.sqhk.co/lowanivari/gggi7qQ/4375678232.pdfIn PDF document text
    • http://kurisuk.22web.org/genetica_medica_essenziale.pdfIn PDF document text
    • https://cdn.sqhk.co/bibilofefi/0jfuiOD/66356975683.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxokagad.epizy.com/dazif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/956a8ecd-cdd1-4835-9aee-e2d50c4dae07/arabic_language_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dddcf000-4670-4233-82d2-208129096f0e/que_son_las_purinas_en_la_sangre.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_d0dd54620a4d488f903591ebce14208c.pdf?index=trueIn PDF document text
    • http://jozizirepimetel.rf.gd/27593355068.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_486b030baf6245e1b9d7e16312164e0d.pdf?index=trueIn PDF document text
    • http://fefuvorezikoko.epizy.com/avr_atmega32_datasheet.pdfIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_38aae8ea25964a49a1dfb7d5e0bc2ca3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2903f58b-8c54-4e9d-8cf9-95220e1ad5c6/mercury_15_hp_4_stroke_parts_manual.pdfIn PDF document text
    • http://pogetowem.onlinewebshop.net/sunebareruzojezix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ed2a0e1-9400-42cb-8ab8-bb47af231d84/cara_membuat_spyhunter_4_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a86c959d-6e80-4f50-9cc2-0e88cd8672cf/electrical_engineering_degree_requirements_tamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ade7671-fbaf-4c53-8a6d-9988c211d963/fozakesinipuvekipuvip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dccf6fcb-4b31-4c0e-8eef-b54e8b4179bc/1415814281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e86a6fbf-75bf-4fad-b7e9-25731eb19fab/15084551464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b0f1673-be09-4d9b-b022-cf7e510dcece/81626963417.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_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 5088 bytes
SHA-256: 7a1131bcc02f823ab697639d2abb0e3bcbd08c775ea148e34d140865b7b7e618
font_01_sfnt_off00010242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 11408 bytes
SHA-256: 9be299b791549e400e4573c2e881323a305ac4d358f9b39b8532e7a96de67908

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