Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c6e4b3a4591923…

MALICIOUS

PDF

81.7 KB Created: 2021-03-30 02:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 11fa2ed4c4356356cf6aaeb4b9931339 SHA-1: 8a749b9b8f148e90f08e736902732d1e8a9621cb SHA-256: 21c6e4b3a4591923b41fd0934ad9810c4ac8a1f7fb45328b5326f1b7f474cacb
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 0.9997

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://baarspo.ru/award?keyword=german+grammar+books+for+beginners+pdf PDF link annotation
    • http://pemufosapakem.mypressonline.com/perbedaan_tanaman_c3_c4_cam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482631/normal_60286778c570b.pdfIn PDF document text
    • http://xomerisupudegop.medianewsonline.com/lebesgue_measure_and_integration_by_jain_and_gupta.pdfIn PDF document text
    • http://wavasesinile.22web.org/endocrine_system_worksheet_word_search_answer_key.pdfIn PDF document text
    • http://fuzubijixulux.mygamesonline.org/dan_abnett_legion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385633/normal_601947f86031b.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/85611534800.pdfIn PDF document text
    • http://jawixogu.mygamesonline.org/a_christmas_carol_charles_dickens_plot.pdfIn PDF document text
    • http://sokojutefame.iblogger.org/48827931152.pdfIn PDF document text
    • http://mamimufexaliro.66ghz.com/56326022026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449616/normal_6032ccef31a16.pdfIn PDF document text
    • https://mibugekokedepi.weebly.com/uploads/1/3/2/6/132682655/d5b2c8.pdfIn PDF document text
    • https://viwosakizipisot.weebly.com/uploads/1/3/5/3/135321869/mibus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409801/normal_6029063d79497.pdfIn PDF document text
    • http://finomimetafix.sportsontheweb.net/30249343607.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444852/normal_5fdd3c0e8b2b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://barodifa.rf.gd/lisunipobojinesop.pdfIn PDF document text
    • http://xazopufegi.onlinewebshop.net/rirelenixidugusaxilugaxax.pdfIn PDF document text
    • http://jotunoxageleza.rf.gd/answers_of_chapter_10_science_class_9.pdfIn PDF document text
    • http://fowakoleviwamop.onlinewebshop.net/45629355396.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 5272 bytes
SHA-256: e9e78c305ad82cf238849281ac6574b1e97703eed1f56682b8a6034d032af3c1
font_01_sfnt_off00010333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10333 11404 bytes
SHA-256: 18d48991dc755761bc5a91445ea5e8383346d5ee9d8608cb00648fd566b88e31
font_02_sfnt_off000129ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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