Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c9f4c4d338ed47…

MALICIOUS

PDF

84.8 KB Created: 2021-03-12 19:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f71c60e192e08fdd0567abe0dbb84f07 SHA-1: 5ddc143be8fe59ccd775a858266d10219d4afd01 SHA-256: b9c9f4c4d338ed47aa1f5c431c5d1f9bb270b97544fef90f38e1e3c210660dee
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://baarspo.ru/123?utm_term=azur+lane+guide+equipment PDF link annotation
    • https://xivanolub.weebly.com/uploads/1/3/1/3/131380121/cae2d97fdf90465.pdfIn PDF document text
    • https://niritamin.weebly.com/uploads/1/3/4/4/134486676/405ad09ac.pdfIn PDF document text
    • https://vudemigubujesi.weebly.com/uploads/1/3/5/3/135300151/tevinetazuredesesav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fcaf55915185.pdfIn PDF document text
    • http://figupatofewox.iblogger.org/life_cleric_dnd_5e_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389821/normal_5fcbb933befb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496816/normal_5fc8d9dcba25c.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/b996a76f-2c46-49ea-bf91-11a064c200ae/24262337904.pdfIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_6e4422d556a043288e09753d70fd8abe.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_d8e3b9b9d3fc434ba9d1fb459a31c81a.pdf?index=trueIn PDF document text
    • http://nuruvowaj.rf.gd/nujipilokafozixediko.pdfIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_6821c211a06a491fa92f6242238a81b3.pdf?index=trueIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_215e646869fa45a6acabdbb41a52e740.pdf?index=trueIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_b36b94a5416547808397333d42cee71c.pdf?index=trueIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_ed74c7b5908d4cc4927054c9d1648d66.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f55b5a13-81a5-4f34-8c02-b031ca4d5da6/formula_to_calculate_gdp_per_capita_growth_rate.pdfIn PDF document text
    • http://sosozodazu.epizy.com/physical_science_book_grade_11.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_a4763ef34cb84da3a70950bbe8f73e7b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9706d85c-9df2-475a-aa40-1375b396047c/how_to_help_auditory_processing_disorder.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_923d7dc7f2bb47a58298ab94edb32178.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 6344 bytes
SHA-256: 0cfb7576a1d21a4bcc6601486803ed895d3148b8ac24efe3875c8233766dfb3c
font_01_sfnt_off00010dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 5264 bytes
SHA-256: 0b9bc1adad998fe403ec4fd53042e93a40fd12dbcc18d6cdbb3ef218a7ce39ca
font_02_sfnt_off00011f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F98 11108 bytes
SHA-256: 73975637d0e0e66601b6b8eb177fd18c4c15e723ee073b304dcf43abb1ebed43