Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f444b2578e1bfd…

MALICIOUS

PDF

76.3 KB Created: 2021-04-11 02:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2092902c30e5012ed692ac704171c4ea SHA-1: ea60d1873ae86de6eed6870b78c1967beb599450 SHA-256: 74f444b2578e1bfda1b244e8172860c16f5dbb72455680b0439fa17ffdf545e3
126 Risk Score

Malware Insights

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

The PDF file is classified as malicious by ML and ClamAV, and contains numerous external URIs pointing to disposable hosting. The document body, though heavily obfuscated, suggests a lure related to knitting machines. The presence of many links to potentially malicious or spam-related domains indicates an attempt to redirect users to harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=how+to+use+a+knitting+machine+ribber PDF link annotation
    • https://cdn.sqhk.co/totudavomud/XeidDgh/xalofuxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424024/normal_60144453ec138.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/Mjagjia/95436006352.pdfIn PDF document text
    • https://cdn.sqhk.co/xetajikok/uhgUhhG/30785157937.pdfIn PDF document text
    • http://fenuxove.22web.org/how_to_update_s7_software.pdfIn PDF document text
    • http://tadidavazutopa.sportsontheweb.net/12807475252.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_603af39959b3c.pdfIn PDF document text
    • http://gejulavofanutar.mygamesonline.org/free_nkjv_bible_download_for_pc_windows_7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_605857fe2a451.pdfIn PDF document text
    • http://xelibirujegid.mywebcommunity.org/lonusumisujelidogitemofa.pdfIn PDF document text
    • http://kimujedat.mygamesonline.org/area_and_volume_formulas_for_all_shapes.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/mosenebi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413369/normal_600251c229442.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/fjgjh8G/in_q_tel_investments.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sawesupunozigiv.atwebpages.com/burejamavivepojowu.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/13046712946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e975936-b292-42b6-af52-d5ffb15bdcf8/super_mario_land_gameboy_levels_31.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f803ded-3da0-407d-b68c-6df4d7436e48/39799848448.pdfIn PDF document text
    • http://lifukifeja.epizy.com/bad_romance_piano_sheet_free.pdfIn PDF document text
    • http://kurerori.myartsonline.com/blow_film_extrusion_process.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_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 5440 bytes
SHA-256: 5fa2ca5be530d8bd288bb1a59c3a00c49dc03f7531e46774dfe9eaf1895f1fb0
font_01_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 10544 bytes
SHA-256: 024b47c9aa0149f22f6c82012b329ebdf8d5ba115fc808e180a5ee6686399e2d

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