Malicious PDF — malware analysis report

Static analysis result for SHA-256 773bd48481e5065b…

MALICIOUS

PDF

75.6 KB Created: 2021-04-05 12:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 61b5f58b28e942a5dd938ac221445c88 SHA-1: d16de1c6f6ef184b9b036b3ce0b4c83341a4cfd3 SHA-256: 773bd48481e5065ba239d0c3f41fb3ef54f5358ed8c0ce652aab9cafe4944282
244 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. One critical heuristic indicates links to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and link farm nature strongly suggest an attempt to lure users to malicious content or phishing pages.

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://yafferge.ru/wix?keyword=white+hat+eulogy In PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://guxemufisi.weebly.com/uploads/1/3/2/7/132710659/lirasejon.pdfIn PDF document text
    • http://tixshopclub.space/gofeniwasumebupev6doy6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490738/normal_5fe1f3e21f6d1.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/gjggggi/acdc_pinball_skill_shot.pdfIn PDF document text
    • https://cdn.sqhk.co/bojiluxenome/ijhj3qQ/private_wifi_mobile_app.pdfIn PDF document text
    • http://dostafood.xyz/how_to_use_acurite_meat_thermometera93y2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_605313de9adb8.pdfIn PDF document text
    • https://vokarojunez.weebly.com/uploads/1/3/2/6/132696330/zasexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454820/normal_6019a7380b8ca.pdfIn PDF document text
    • https://benerema.weebly.com/uploads/1/3/1/4/131408328/nivamif-samotu.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/dBia8hc/framed_29er_spacecraft_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvuzebilet/ia7LJij/extraction_movie_flix_pro.pdfIn PDF document text
    • http://wonnaturila.space/high_thread_count_sheets_worth_it1cwfd.pdfIn PDF document text
    • https://xadifopelizil.weebly.com/uploads/1/3/4/7/134771643/62102e02734.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465941/normal_60035ad4efb3d.pdfIn PDF document text
    • http://icub.tech/1333778158k2h5q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_bdfa95761d7743c78a2ca52ae534bb65.pdf?index=trueIn PDF document text
    • https://e1c07d4e-6587-4767-b76f-5dea9cf3e327.filesusr.com/ugd/51a829_2a96888af7ce49f58abeb20061f96951.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_876b49280f4e433a918c05201210cacb.pdf?index=trueIn 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_off0000eb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB95 4788 bytes
SHA-256: ea56bb4aa859df289fb3ce05eef790e287b307529543838fe38a2dee9a44eae0
font_01_sfnt_off0000fbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 10936 bytes
SHA-256: 165501adb63852b96558165c8393609d76f62a096418453702980a4adfb0c3a6