Malicious PDF — malware analysis report

Static analysis result for SHA-256 551cb20d4d3e3b3e…

MALICIOUS

PDF

76.6 KB Created: 2021-03-16 13:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1c0337ba2f7e28edf72a23b15993c8f3 SHA-1: 1241a615aab6277c2845cd5c33b0a0c68bdb8c72 SHA-256: 551cb20d4d3e3b3e1cf838fdf88c0d64dd07fc8487b4a8c6869edd48f0c2b1e3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9999

Heuristics 5

  • 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 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/wix?keyword=guide+me+o+thou+great+redeemer+lyrics+and+chords PDF link annotation
    • http://gta-msk.ru/vowasamixeritafdm25.pdfIn PDF document text
    • https://cdn.sqhk.co/gogerazina/cOjQidt/vufezumikanefeji.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/ha2Xwgd/kohler_toilet_running_repair.pdfIn PDF document text
    • https://cdn.sqhk.co/xoraxuvonaf/BGhgDgi/6361601272.pdfIn PDF document text
    • http://knitfqph.site/kinemaster_pro_for_pc_windows_10_free_downloadqzxjn.pdfIn PDF document text
    • http://load-bcp.com/dalotopasegejum5xkuu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_221c3aae8e234e57b38edb86b7450fa2.pdf?index=trueIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_39eb7828c6364926beeaaf2a0f4a85cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/sosipubazefomometodejetir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa856ec-ec20-45f4-b425-eda360165bb5/89726754973.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/topaxezakivilesusewa.pdfIn PDF document text
    • https://s3.amazonaws.com/dinisemowoge/zujoxanadepit.pdfIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_8c04040734d64b54b27fcfa421b21ef1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dadupawo/mathematics_for_economic_analysis_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/21687529512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/756e8ae4-545c-4e40-b6cd-aec5e923abb3/first_grade_math_books.pdfIn PDF document text
    • https://d190c387-1498-4382-a59e-98d1a0a9794c.filesusr.com/ugd/a91264_96ed133003194a15b965f794767c6c70.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_e7e74df73e9446588b8a4c3000e9f637.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_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 5488 bytes
SHA-256: c2e442c699cb920c706d40d5bc56148c73a3c7f1bc9c7e830f26d3ef7b95bbd4
font_01_sfnt_off0000fa8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 11900 bytes
SHA-256: 8c2e3df8e4c3e506a684455b5e095c9b1db2427b29469cb39c9a12e0495f3c63

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