Malicious PDF — malware analysis report

Static analysis result for SHA-256 76532ee9493cb052…

MALICIOUS

PDF

77.5 KB Created: 2021-03-13 13:54:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8e76b7d1ad899459b0e8b2ea09071445 SHA-1: ab8d54cbb0ea515d349785de6fb0ded8f43df8cf SHA-256: 76532ee9493cb0520dbdc9775f7f3fb7f600a32d35b86906cde31df4bb95e784
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a PDF link farm. It contains numerous external URIs, many pointing to disposable hosting or domains with unknown reputations, suggesting an attempt to manipulate search engine rankings or distribute further malware. The presence of multiple external PDF links and the overall structure strongly indicate a malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

Heuristics 6

  • 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 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://bologen.ru/award?keyword=7+canciones+populares+espa%25C3%25B1olas+pdf PDF link annotation
    • http://spiritstudio.ru/94628032902pmvvx.pdfIn PDF document text
    • https://cdn.sqhk.co/javufikari/gcidb6h/14755962542.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506131/normal_60008316e3c31.pdfIn PDF document text
    • http://fartook.online/kubonunupebikupefemazouabr.pdfIn PDF document text
    • https://gisijenoxumo.weebly.com/uploads/1/3/1/4/131437849/14cf4b8ad51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489598/normal_601dd63cb7ec7.pdfIn PDF document text
    • https://pabovojusu.weebly.com/uploads/1/3/4/3/134339388/zelan-zamasowiwov.pdfIn PDF document text
    • http://energytik.net/barnett_vortex_hunter_compound-bow_package18i4m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_602080ce0c9e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451365/normal_6041cd3186543.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387412/normal_600129295e5ff.pdfIn PDF document text
    • https://jabenawonidibe.weebly.com/uploads/1/3/5/3/135385032/14097a70d953.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/a72c478.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/zhjcgcp/elvis_presley_greatest_hits_vinyl_box_set.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/07a8afa0-c539-4947-af73-567f6036a4ca/how_to_set_up_blue_clean_power_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc87ec61-20d6-49a2-8f6a-bc1e8bacab7b/starcraft_2_legacy_of_the_void_mission_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1009a70-1f5c-45a6-bbfd-52b2dcb807e1/2005_dixie_chopper_silver_eagle_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dbff12d-2135-4b1b-bb01-59bffadc4590/minurekusajiwusorej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d43c76d0-5d6f-4046-b00d-8b9da4946964/why_would_a_samsung_refrigerator_leak_water.pdfIn PDF document text
    • http://tunufefenus.rf.gd/soxibigexemagufog.pdfIn PDF document text
    • http://zudovufakigib.epizy.com/74445478442.pdfIn 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_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 5344 bytes
SHA-256: 7eef888ed8bbf18a613be66e877e910bf1ffdc23b8bbf20bd879761e122a6db2
font_01_sfnt_off00010a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 13452 bytes
SHA-256: e9354b6bb08d743149c727984e66c651d4aa38ede3f0f62e3b1e0c82919d9a3f

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