Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5e51e15ee96b1e…

MALICIOUS

PDF

74.0 KB Created: 2021-03-27 20:32:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4919f1791b132b9967bc465032b204fb SHA-1: 27ba5006c8011a198e6b67df00f74ef461eb20c9 SHA-256: 6a5e51e15ee96b1e47d6b4759965d6a1af96a7d318aca6e8441f4fdf85f1b4b5
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were extracted, the presence of malicious links suggests an attempt to redirect the user to a compromised site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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.
  • 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/strik?utm_term=kohler+flute+etudes+op+33+pdf
    • http://aycotoro7.xyz/protocol_flix_helicopter_partsqoz74.pdf
    • http://sewawena.scienceontheweb.net/aaoifi_shariah_standards_book.pdf
    • http://1xbet-regi.site/losexenalumifowiv7gf03.pdf
    • http://salonhq.xyz/678494443592ytyg.pdf
    • http://vexoxem.scienceontheweb.net/minority_scholarship_form_2020_20_download.pdf
    • http://duwudivusupo.mygamesonline.org/jupefokumedivizewupabofek.pdf
    • http://wugumonisukanib.sportsontheweb.net/megujoxilipawakufizuku.pdf
    • http://nomenowunesazoz.scienceontheweb.net/15092534227.pdf
    • http://megantv.site/902700550uajk5.pdf
    • http://xijulefabogi.getenjoyment.net/murachs_html5_and_css3_4th_edition_ebook.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_2693accc9ab84c1dad1a111777ae1607.pdf?index=true
    • https://s3.amazonaws.com/gazijewevan/quality_management_in_healthcare_article.pdf
    • https://2acf176d-1645-44e4-83be-c67f7ac9af6b.filesusr.com/ugd/e72dd6_3906d88485934bf9bb4eaa193e237d03.pdf?index=true
    • https://s3.amazonaws.com/zifilobesumafi/xoriwewujibome.pdf
    • https://s3.amazonaws.com/lakadutof/babuvetta_song_mp4.pdf
    • https://uploads.strikinglycdn.com/files/d509baea-f88b-4fb3-a674-0125c4e52735/zaxelupelumusorovofi.pdf
    • http://xowobovu.myartsonline.com/xugeluno.pdf
    • https://uploads.strikinglycdn.com/files/8e8b54a9-27e3-4bf4-af53-780f4fc94ba8/how_to_use_john_the_ripper_on_windows.pdf
    • https://uploads.strikinglycdn.com/files/d10249de-b20f-4205-b039-7ddc7ee03c64/beretta_a300_full_choke_steel_shot.pdf
    • https://s3.amazonaws.com/perurulexi/mugugipezegoxagemubigavi.pdf
    • http://zasuwunal.myartsonline.com/finezemodebujivijafipikal.pdf
    • http://tiwatimab.atwebpages.com/19796834291.pdf
    • https://s3.amazonaws.com/wolawatin/pomivodujeburizobosav.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd85.bin
af019129b6e53e37e7268bff3e172d32e00eb938e199e1f0948a4384970e928a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD85 5052 bytes
font_01_sfnt_off0000debd.bin
7492d16ac425a874d6a92d5c42463d2a2ce78feed824455abc21d69d0ac2f399		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 10868 bytes
font_02_sfnt_off000103af.bin
3bb08857b08983a257d5a2052628e18542fd51c8d29f5bbef87ea8b8ace00841		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 16096 bytes

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