Malicious PDF — malware analysis report

Static analysis result for SHA-256 938d668dbc6dc67b…

MALICIOUS

PDF

122.0 KB Created: 2021-04-24 17:27:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: eb694495f85f66c8dc87185762544805 SHA-1: 2576ca808193301b787a67661438a2510b8c730c SHA-256: 938d668dbc6dc67ba52279fcce833cd33491dff2e41bcfe82743176fb95afd99
126 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs, including one pointing to 'jottigo.ru', which is flagged as a phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://jottigo.ru/strik?utm_term=sodastream+one+touch+black+friday+deals PDF link annotation
    • https://wodikaludesavoz.weebly.com/uploads/1/3/1/4/131453455/nibezu-wuzinumagab-gogepefilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387817/normal_5fd76f51c5cb6.pdfIn PDF document text
    • http://tujijamutibe.sportsontheweb.net/7233152417.pdfIn PDF document text
    • http://widaluvawigomum.scienceontheweb.net/zuwasida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401983/normal_605d5f81f3283.pdfIn PDF document text
    • http://tedisesux.22web.org/kure_beach_fishing_report.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/vazajobukira-manupajazeroke.pdfIn PDF document text
    • https://tirotulesi.weebly.com/uploads/1/3/4/8/134849952/fec82530ca328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412588/normal_60442f2e7a9f9.pdfIn PDF document text
    • http://wamabivunufoteg.medianewsonline.com/gugidigenaw.pdfIn PDF document text
    • http://tunumurelumuget.iblogger.org/how_to_run_keygen.exe.pdfIn PDF document text
    • https://xefezabegeritaj.weebly.com/uploads/1/3/1/3/131379478/luguviwu-xutenovazemaxe-javawawubuwotaz-lobujitanajuta.pdfIn PDF document text
    • http://botefedej.sportsontheweb.net/10908972043.pdfIn PDF document text
    • https://pivamuwonojazop.weebly.com/uploads/1/3/0/9/130969183/870629.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446015/normal_604d0b74551e2.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/algebra_lineal_grossman_septima_edicion.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/88d6da4d-c7c4-433c-ae6b-cdcea93952da/thermaltake_core_v1_snow_edition_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2ec1df2-00bd-4cf3-9b39-7369c40a6937/autocad_free_download_for_windows_10.pdfIn PDF document text
    • http://meziwupagev.epizy.com/zerurolitiwezefem.pdfIn PDF document text
    • http://gununusaw.epizy.com/currency_forward_contract.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/884bf35f-d0e1-4777-a827-8ae160980ec8/is_chicken_soup_for_the_soul_real.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b184b848-1238-4200-9661-f9d6bbc8e3d8/sap_pp_tutorial_point.pdfIn PDF document text
    • http://doritiwenoxa.onlinewebshop.net/2512771059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78de4f67-53da-40ef-a5ba-04b0898e2764/the_pleasure_trap_book.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18454 5672 bytes
SHA-256: 526c28d6c891cab32c37c37ec69863f9b98af0a0c44b038ffa51b6a6193d0757
font_01_sfnt_off0001977c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1977C 12792 bytes
SHA-256: ff4244231325ef2bb8afe93deb7fb9240bd2915ac9a72d2560b72d041d75e0cd
font_02_sfnt_off0001c271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C271 16268 bytes
SHA-256: b5ff79dfb15ab1ebf53152cc6013efd3b3f7a4191ec000fbbdc11229bd7fc154