Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a1ebf67c907f9c…

MALICIOUS

PDF

82.0 KB Created: 2021-03-18 17:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e933f404508998102e4612ef413c8ef SHA-1: 3b7cce1a473a0df42d9f546d9e2b6a5082866fa9 SHA-256: 71a1ebf67c907f9cf87aeaff7a5928241f154456960c7966c759e11f5e288a56
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and the 'link farm' detection further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=excel+2007+bedingte+formatierung+ampel+datum
    • https://cdn.sqhk.co/barugogip/gjbhbjj/bijamagewu.pdf
    • http://joraxabe.iblogger.org/brachial_artery_anatomy.pdf
    • http://bibujajed.22web.org/maharashtra_budget_2020_19_in_marathi.pdf
    • https://cdn.sqhk.co/dijexovesaf/hitghG8/moto_bike_racing_stunt_master_mod_apk_download.pdf
    • https://cdn.sqhk.co/pajokiman/fVXgjih/dreamer_lyrics_heartland_theme_song.pdf
    • https://cdn-cms.f-static.net/uploads/4479917/normal_601dc101bdbbf.pdf
    • https://cdn.sqhk.co/runudori/jhhegg7/99564847776.pdf
    • https://cdn-cms.f-static.net/uploads/4410414/normal_600f9e9961f82.pdf
    • https://cdn-cms.f-static.net/uploads/4389090/normal_601e197918133.pdf
    • https://cdn-cms.f-static.net/uploads/4414848/normal_5fdc333415a68.pdf
    • https://static.s123-cdn-static.com/uploads/4415081/normal_5fe2584bcaf74.pdf
    • https://cdn-cms.f-static.net/uploads/4473410/normal_603f2d9a4c058.pdf
    • https://cdn-cms.f-static.net/uploads/4489734/normal_600a8ac51b652.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://ketugida.rf.gd/64249017702.pdf
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_76e0251216a94153acd661093fa76237.pdf?index=true
    • https://a208a2de-cee2-48c2-86e3-c620a022946d.filesusr.com/ugd/dda32d_138fc9b41987461e8ef4bf7b0c029296.pdf?index=true
    • http://kusukod.epizy.com/60138173648.pdf
    • http://memenusaduso.rf.gd/dujalomiveladexuvag.pdf
    • https://s3.amazonaws.com/wozoxub/memifijixigu.pdf
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_c325fb2cc7cd4848881c4c5972e8fa91.pdf?index=true
    • https://s3.amazonaws.com/daraniwekamidir/11349735743.pdf
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_4bdc7a9387be4386bbea1d0e3b114895.pdf?index=true
    • https://s3.amazonaws.com/jotizifime/50_tons_de_liberdade_livro_completo.pdf
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_89d8bdb74dab45cd8dcc10296db3d4e7.pdf?index=true
    • https://s3.amazonaws.com/lofese/manivof.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1da.bin
98d000c577b25d1721ae1486a478624b303b568b105c4c03df544b50e7d691c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 5696 bytes
font_01_sfnt_off00010527.bin
4e5dcdca1d3ba88564f9ebf3c88fe94528883f1721c887c404a5eb01eafe68d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 11684 bytes
font_02_sfnt_off00012bdf.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDF 4324 bytes

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