Malicious PDF — malware analysis report

Static analysis result for SHA-256 deafc6f63a4b61b6…

MALICIOUS

PDF

78.5 KB Created: 2021-03-28 04:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f817a837c88eec2962717538c1fa32e0 SHA-1: dfb12bc5dbe82a8e8637fd4056157644054fbd09 SHA-256: deafc6f63a4b61b6c4112dabafd0545652d5236cf2e6cad4608b2b60b4d219cc
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that are flagged as malicious redirectors, pointing to infrastructure designed to lure users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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 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=cset+physical+education+study+guide In PDF document text
    • https://static.s123-cdn-static.com/uploads/4426277/normal_5ffd721131dca.pdfIn PDF document text
    • http://bamejudodenor.iblogger.org/resident_evil_biohazard_game_for_android.pdfIn PDF document text
    • http://tawesukosipot.22web.org/what_is_better_than_power_of_attorney.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489852/normal_6018fc7972546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409998/normal_6054a99b8f3c2.pdfIn PDF document text
    • http://nezikitif.iblogger.org/995402586.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d19688e0-347f-4d9d-8cb3-d47c6e049f3d.filesusr.com/ugd/c618e9_caa7bca5514b4b15bdbe787f3d2841f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/26081663890.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6d500b6-160c-4340-b525-3c5b44c4ca4f/71912415683.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/tawuzewebenamikeneb.pdfIn PDF document text
    • http://limixumijegaf.epizy.com/padamadobekokosizu.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/97667957269.pdfIn PDF document text
    • http://nabinoxifod.epizy.com/applied_mathematics_books_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/wupuzup.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/9527260005.pdfIn PDF document text
    • http://fomobiwudaz.rf.gd/java_8_api_docs_download.pdfIn PDF document text
    • https://79f67b98-100a-41ac-8a2f-4880133f117e.filesusr.com/ugd/f12c90_a15a5b9b976f43b19cc55bb7cc8165dd.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_9fd386a954734e2ab04688cb33189a97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e7e392e-0998-4219-a94e-1e8386ae38b6/dd_5e_unearthed_arcana_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d1a1d5d-3849-4b0f-b7ee-f0ed76df5b7e/how_much_is_pete_best_worth.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_8d2d343177c442648252d279fb155ffd.pdf?index=trueIn PDF document text
    • http://tawegimasozaj.epizy.com/momuxifurogididenar.pdfIn PDF document text
    • http://sibuxolubi.epizy.com/19707022398.pdfIn PDF document text
    • http://nunusama.rf.gd/digimon_world_2_psx_digivolution_guide.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_6de1eef7af074c1c92f6ab7c2606386d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3519dae8-d625-4d67-907d-bb28bda134fe/witegegomesedujexo.pdfIn PDF document text
    • http://vedexokorixika.rf.gd/seveve.pdfIn 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_off0000f4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FD 5248 bytes
SHA-256: 3512b396b93623b5822053ca8d40745f4f870a0108c1715dfd0731dd634e94e0
font_01_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 10892 bytes
SHA-256: 1c5beb3599b814d58512d8ffd67878d85321a0e6cc2dfa281c3cb330dec797b6

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