Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d24035357a40754…

MALICIOUS

PDF

67.8 KB Created: 2021-05-31 23:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fc2500f1659d1ea8ea6e3f7334b9702 SHA-1: 9f59c6902514c0a1266d46e78b1d58d2f4cc6dfc SHA-256: 7d24035357a40754fa54fa6a87cae7a153793d5de45d76c68654c8365dba98c0
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm for SEO purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware-hosting sites. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to exploit users through indirect means, potentially involving embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9227

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://infrive.ru/pbw?utm_term=what+is+the+function+of+benthic+zone
    • https://cdn-cms.f-static.net/uploads/4420761/normal_6061e5f37cf45.pdf
    • https://static.s123-cdn-static.com/uploads/4490746/normal_5fef7f2cd2650.pdf
    • https://tiledumojamusej.weebly.com/uploads/1/3/4/0/134096308/8240854.pdf
    • https://cdn-cms.f-static.net/uploads/4412757/normal_600db98382744.pdf
    • https://static.s123-cdn-static.com/uploads/4389599/normal_5fcfe8b62b654.pdf
    • https://cdn-cms.f-static.net/uploads/4471256/normal_602885527be17.pdf
    • https://cdn-cms.f-static.net/uploads/4417129/normal_5fd3d8f22e358.pdf
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/5207622.pdf
    • https://cdn-cms.f-static.net/uploads/4378852/normal_60538a491a53a.pdf
    • https://jigazukenu.weebly.com/uploads/1/3/5/9/135964778/varesorudowa.pdf
    • https://cdn-cms.f-static.net/uploads/4404740/normal_5fd3692d86b9b.pdf
    • https://cdn-cms.f-static.net/uploads/4480732/normal_60591bc232cfa.pdf
    • https://fupelesanu.weebly.com/uploads/1/3/1/6/131606305/tuxonejubososav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c66fffd7-68d0-445f-a9d3-50baf67f7c0c/28487492789.pdf
    • https://uploads.strikinglycdn.com/files/686a7c03-decc-4784-8888-03f32e5ef289/4146727532.pdf
    • https://uploads.strikinglycdn.com/files/ee465699-3693-4367-afee-355b8a4bd378/golds_gym_xrs_20_weight_bench_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/55d9f9ef-d7ee-4af8-b569-aa95ce618ea8/how_to_install_previewer_in_outlook_2010.pdf
    • https://uploads.strikinglycdn.com/files/59b2217a-c178-4db8-94ee-f8ba87b9072f/39210408978.pdf
    • https://uploads.strikinglycdn.com/files/c754552e-14db-4f95-bf77-8e2b3e0377ae/mgma_family_medicine_salary_2018.pdf
    • https://uploads.strikinglycdn.com/files/047dfd89-1998-4aea-beb2-79226503e11c/luwinizexud.pdf
    • https://uploads.strikinglycdn.com/files/99ff4771-a01a-4d04-93c0-be5d9415a3b8/48608070439.pdf
    • https://uploads.strikinglycdn.com/files/7ba6dea6-7d6f-4c47-801e-4d269fa6efde/how_to_peak_and_tune_a_bearcat_880.pdf
    • https://uploads.strikinglycdn.com/files/22226391-5c74-439c-8e8c-715e283c0178/how_to_size_battery_fuse.pdf
    • https://uploads.strikinglycdn.com/files/9b400a8f-0847-4775-832e-2b2a48915440/27851450074.pdf
    • https://uploads.strikinglycdn.com/files/54049e6a-16da-4472-a0ff-cd39aaac346c/ge_profile_electric_range_self_cleaning_instructions.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c6.bin
202d479c696d3ed205e5b96295f1a2ab73e9fdd978a40fef8d04dabe562605cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 5044 bytes

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