Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56f1e7b1db21473…

MALICIOUS

PDF

78.3 KB Created: 2021-03-30 00:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 96edd2a3484bc307e367c086ed7b997e SHA-1: 932199405272346157c8d8692c125bb237d0ffc8 SHA-256: c56f1e7b1db214739f5e2ef484653436cb5cfbbc9f43e6dbbdccf6168e8fa80a
244 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to disposable domains or known malicious redirectors. The document body, though heavily obfuscated, appears to be a lure related to medical guidelines, likely to trick users into clicking the malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=copd+gold+guidelines+exacerbation In PDF document text
    • https://rezodipegizosif.weebly.com/uploads/1/3/1/6/131606434/buteboxaluwoposojud.pdfIn PDF document text
    • http://secureappeal.com/voresomebuvonaburezudawijlhdz4.pdfIn PDF document text
    • http://sesizuxewewax.mygamesonline.org/vigexatabelibavejituri.pdfIn PDF document text
    • http://strita.space/73710338165laucb.pdfIn PDF document text
    • https://dunogijejuj.weebly.com/uploads/1/3/0/8/130813547/b0cc254166.pdfIn PDF document text
    • http://lnstagram-blue-badge-form.com/nora_fatehi_new_song_download_mp3_mr_jattn69b5.pdfIn PDF document text
    • https://xekariwunaju.weebly.com/uploads/1/3/1/0/131070431/2999884.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://wewogubebomev.weebly.com/uploads/1/3/4/6/134692169/zadogizuxoz.pdfIn PDF document text
    • https://rovoduwomu.weebly.com/uploads/1/3/5/3/135332400/9896457.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/63666853589.pdfIn PDF document text
    • http://vazawujuzu.sportsontheweb.net/first_grade_math_addition_worksheets.pdfIn PDF document text
    • https://xupijologa.weebly.com/uploads/1/3/5/3/135327862/d17e0a2e0e.pdfIn PDF document text
    • https://numokafi.weebly.com/uploads/1/3/2/6/132695525/turulivipef.pdfIn PDF document text
    • http://legrand-spb.ru/avengers_infinity_war_theme_sheet_music_trombonefw3ny.pdfIn PDF document text
    • http://vujenixuwo.mypressonline.com/vupazunopuwugidelorolar.pdfIn PDF document text
    • http://santand-es.com/beats_solo_2_wired_headphones_warranty4ctb4.pdfIn PDF document text
    • http://repair-planshetov.ru/xixejelxy09u.pdfIn PDF document text
    • http://topcabinets.xyz/wefiwanixavanefokpbs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_8066fbedcf1f419d810ef0104edf50b4.pdf?index=trueIn PDF document text
    • http://fogovulosuzan.onlinewebshop.net/23210327629.pdfIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_bdd9949604c140299a5556514f27b35b.pdf?index=trueIn PDF document text
    • https://e301b21f-f707-426c-a094-6199d4b1a2d6.filesusr.com/ugd/f65518_9f8d11d6b4154a4187a8f68afe68bfc0.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_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 5352 bytes
SHA-256: 4cf38430c20214e32c4a54a8dd0e946a6c2ab7162e576dd319b5199161a38624
font_01_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 10960 bytes
SHA-256: 9b7164bae014d9038650612f609184fca4fcd07e7c88675f6606fad85f9202e4

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