Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7ff6306e029435…

MALICIOUS

PDF

74.5 KB Created: 2021-05-08 08:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6451fa988063cbbe8a429078147c86c9 SHA-1: 05110d174dbb75d8ccd236e8de87bd9adf2e5ed0 SHA-256: fd7ff6306e0294355f673c9fac18d27931dbc4ec72904b40d67d0a06e1f036ee
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, and it contains numerous embedded links. Several of these links point to known malicious redirector infrastructure or disposable hosting, suggesting an attempt to distribute further malicious content or phishing lures. The document body, though partially corrupted, contains a URL that aligns with the heuristic findings of a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=why+is+my+manual+gear+shift+hard+to+move In PDF document text
    • http://rakijizesegag.22web.org/41367832522.pdfIn PDF document text
    • https://fadusoga.weebly.com/uploads/1/3/0/7/130739873/luvojil_susanat.pdfIn PDF document text
    • http://doluridibulif.iblogger.org/boho_chic_bed_sheets.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/vegetarian_chili_recipes_instant_pot.pdfIn PDF document text
    • http://tideparipawovu.mygamesonline.org/25271996384.pdfIn PDF document text
    • https://nabesoke.weebly.com/uploads/1/3/4/0/134042749/c04bc35422bdf5f.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/hfjjYib/rixezokegajisapifor.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/YjipaOQ/pariwadujixanoteg.pdfIn PDF document text
    • http://keniworu.mywebcommunity.org/energy_pyramid_worksheet.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/bdfbd58a-f33e-4348-8638-7095d36017bc/como_pasar_de_gramos_a_mililitros_con_densidad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffae52aa-e12e-4b95-a521-cefeb718ccdb/zitukigupofenomub.pdfIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_309185e5744a4c629238f7c9c0cb65b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b320327c-f84a-44b3-9f40-91cc871e2341/nolawofegexelabives.pdfIn PDF document text
    • http://vukunazovi.rf.gd/864489404.pdfIn PDF document text
    • http://voruvutapojaki.epizy.com/airport_vocabulary_esl.pdfIn PDF document text
    • https://27475d5a-2981-497d-8cd5-0c310ef10f8b.filesusr.com/ugd/9cb927_2d5d3f679de042e380de72802df36598.pdf?index=trueIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_079e9aca376041af9187ecb2c8d5d93a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd3fef94-c705-4a0a-8862-acce084b4009/easy_origami_boat_with_square_paper.pdfIn PDF document text
    • http://ferodibev.onlinewebshop.net/gavozinezenoju.pdfIn PDF document text
    • http://wojibikifi.myartsonline.com/sepukisafigigulidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65d83947-f3cc-4931-bba7-e80fc1a44166/ejercicios_resueltos_de_identidades_trigonometricas.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_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 5496 bytes
SHA-256: 76058d467457673e4bc072485ff7f6eb164c2f33b9b4d55ecab209078fd30dbc
font_01_sfnt_off0000f95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95E 10340 bytes
SHA-256: 7034d9c816a4071eb9bc5e1d7d9b10a763ccadf2776ee942e26bccdc7265bde3