Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1493d5b789c18cb…

MALICIOUS

PDF

98.2 KB Created: 2021-04-25 10:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c77d694d9b7f61d9fad098232ffbdb91 SHA-1: 6c9657c2175f106595169eeeff75fae708b1aded SHA-256: a1493d5b789c18cb8b670ba2b822c6224894ad515e2c7be6701c1e63af180da1
126 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with many hosted on disposable domains and identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were explicitly extracted, the PDF structure and external links suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://vilenefex.ru/strik?utm_term=black+bullet+light+novel+summary PDF link annotation
    • http://tixokapine.mypressonline.com/sodekezoxisawefuve.pdfIn PDF document text
    • https://pamukisap.weebly.com/uploads/1/3/4/7/134761215/ganunofinekow.pdfIn PDF document text
    • http://itverys.space/billboard_psd_freel5tq5.pdfIn PDF document text
    • https://mewurotimopu.weebly.com/uploads/1/3/1/3/131381658/9189695.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://disozire.mygamesonline.org/abbyy_transformer_12_full_pdf_word.pdfIn PDF document text
    • http://sportplays.ru/zukemizedonuvejagzo9w.pdfIn PDF document text
    • https://molobaguzali.weebly.com/uploads/1/3/0/7/130739923/e93312cf4a.pdfIn PDF document text
    • https://rurusoweloxefug.weebly.com/uploads/1/3/3/9/133989150/gimimuf-musejo.pdfIn PDF document text
    • https://pumaxodevuk.weebly.com/uploads/1/3/1/8/131872084/xapumerudedusal.pdfIn PDF document text
    • https://fekakekofum.weebly.com/uploads/1/3/4/6/134656499/1f170695ebf726.pdfIn PDF document text
    • http://beautysss.site/love_does_bob_goff_read_online_freee1gm0.pdfIn PDF document text
    • https://gagividezi.weebly.com/uploads/1/3/4/4/134477411/vagiku-xeludidazub-kolowolorekixe.pdfIn PDF document text
    • http://golomashvanna.xyz/resistance_bands_ab_workout7jole.pdfIn PDF document text
    • http://cucoupon.info/acrobat_reader_viewerdgxgk.pdfIn PDF document text
    • http://ouily.xyz/beautiful_synonym_slangdeet0.pdfIn PDF document text
    • https://lejujazu.weebly.com/uploads/1/3/5/3/135337057/4deed4f9cecc9d.pdfIn PDF document text
    • http://netolenogafa.getenjoyment.net/multiplication_equal_groups_worksheets_3rd_grade.pdfIn PDF document text
    • http://akmurzina.com/badami_bhutanatha_temple_informationxrb8v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://mifotabelimudon.myartsonline.com/64410407816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24852cec-68ae-4a03-b639-56e17bcd7403/how_to_verify_registered_vehicle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87d211f0-9972-4b5c-88c0-4d09b528e75e/hp_officejet_7610_ink_system_failure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f800ecc5-b0c3-4809-a948-bb7d8f5a466e/karcher_pressure_washer_k4_instructions.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 20760 bytes
SHA-256: 6b6ea940928cf5776847e3ba6816791de98cb849fe101f98f64449de37347687
font_01_sfnt_off0001238b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238B 5628 bytes
SHA-256: 369acee836b30bdee4ba3040d082dc5b71d46a0125ee2229280b9248d1922e5b
font_02_sfnt_off0001368b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368B 8136 bytes
SHA-256: 579a6c8fa97c194f6209b738d2cd532a790ee8faee6268ef7cae4d618f2f3c6d
font_03_sfnt_off00014ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA1 19744 bytes
SHA-256: a7e8acbed469ec57849bfd81a74bad56c68d0bfb5fb9f2eb0dff942b7d705b29