Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86aae7bc6e24dc7…

MALICIOUS

PDF

93.1 KB Created: 2021-03-30 12:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b901c790f187ff75b3a7a8320e12051e SHA-1: 71d7d8d18f125f0b3b6cac9ceb272c0ad5e2f4c8 SHA-256: c86aae7bc6e24dc72cfa7a05a42a7ba98711aa0905bb800980dffd199f5d59dc
126 Risk Score

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 0.9997

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://jottigo.ru/award?keyword=nabucco+overture+pdf PDF link annotation
    • https://soxuwewoduxewu.weebly.com/uploads/1/3/4/0/134042667/verovi.pdfIn PDF document text
    • http://fesalasan.mygamesonline.org/sociologia_rural_definicion.pdfIn PDF document text
    • http://linodogeb.scienceontheweb.net/preface_to_lyrical_ballads_1802_william_wordsworth_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/rasidepad/hfnY8jg/87556026830.pdfIn PDF document text
    • http://pufaxokijajijev.22web.org/98642093274.pdfIn PDF document text
    • http://metapilunax.iblogger.org/ama_niamo_music_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/yhejjji/cross_stitch_font_patterns_free.pdfIn PDF document text
    • https://puzaloraren.weebly.com/uploads/1/3/4/5/134510283/tubet-waxodojulobates-gixatisovob.pdfIn PDF document text
    • https://cdn.sqhk.co/tozerutiwezu/djasDhf/jagef.pdfIn PDF document text
    • http://barodowo.iblogger.org/7714775411.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/7230101.pdfIn PDF document text
    • http://zefeziwiluj.22web.org/art_of_the_deal_free_audiobook.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/cbMjQow/35949904431.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/define_economic_profit.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/vYaFpja/36659577450.pdfIn PDF document text
    • https://zegaxazidunuxe.weebly.com/uploads/1/3/4/7/134746987/c979438a6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://legokejapo.atwebpages.com/jatamenefufepa.pdfIn PDF document text
    • http://tokozod.myartsonline.com/ketununusufajaja.pdfIn PDF document text
    • http://weparaxopulo.atwebpages.com/guvatix.pdfIn PDF document text
    • http://kepawomokatuke.myartsonline.com/56164291306.pdfIn PDF document text
    • http://zenakezogutomu.onlinewebshop.net/foxpro_wildfire_troubleshooting.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_off00012eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEA 5108 bytes
SHA-256: bff4037fc18b8e1bbac41a1e6d227687eda9a282ef96c87555290249872e64cf
font_01_sfnt_off00014061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14061 12120 bytes
SHA-256: 6380132355fb512f70fd29a274bb8ec9c509606707a458fe1ac302c0f8ab4f3c

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