Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc74a9be228861f7…

MALICIOUS

PDF

80.7 KB Created: 2021-03-18 02:14:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ab470680ee2257417542938fe47cad09 SHA-1: 4526e75cfdc73237b45bd3234942a40b9e992dce SHA-256: dc74a9be228861f77a3dfca2bf1b50b6255ac9b4482b653d70bf1f0d85ecee22
196 Risk Score

Malware Insights

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

The PDF contains numerous heuristics indicating malicious intent, including PDF_SEO_LINK_FARM and PDF_SUSPICIOUS_LINK_LURE, pointing to external domains. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or to redirect users to further malicious content. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://resalured.ru/award?keyword=adobe+reader+pdf+application+download PDF link annotation
    • https://litorizifugo.weebly.com/uploads/1/3/4/0/134042617/kumaxumedetu.pdfIn PDF document text
    • https://xamubamujizej.weebly.com/uploads/1/3/1/4/131483378/vojiworoji.pdfIn PDF document text
    • https://gosabejeda.weebly.com/uploads/1/3/1/4/131453015/34f6af6d.pdfIn PDF document text
    • http://huseyincanx.com/dell_optiplex_sff_9020_intel_i7-4770hzebt.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/printable_cipher_wheel_templateh2ug1.pdfIn PDF document text
    • http://itanah.space/evan_moor_daily_scienceqgvu2.pdfIn PDF document text
    • https://zukuvexoxowi.weebly.com/uploads/1/3/4/5/134597017/jumivotuxil_waweriruri_zenodada_ferepom.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/wusup-woripuxunulisat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/wixelirim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26a9b195-4e50-4b22-9963-e20a9c3a8379/sharp_calculator_el-2196bl_not_printing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ebc377-1937-4da1-910c-308e0358f402/how_to_find_the_resultant_of_three_forces.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/guided_sleep_meditation_for_sleep.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/samsung_experience_9._5_emoji_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347ff417-deac-4829-917c-2a72c1d4927e/32873988224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/617fde4d-0556-4bbb-93c6-efff1969fc68/10846433006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/299a7e4e-2d23-4b02-b67e-eaaa3f460bc3/quran_in_hindi_with_arabic_pronunciation.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/linking_verbs_worksheets_for_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/puzzle_bubble_game_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/83075894719.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e734d624-a30e-4a68-b467-8bd059b656e3/12675741239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3db13bd-7a0e-4b7c-a377-13c968a17ec5/53040629628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b79e8e0d-0e70-4103-8a3f-5ba4c2ced954/miziminikaxebukuxemuvurez.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/probability_distribution_formula.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/calorimetry_experiment_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/spreadsheet_program_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/nakevoja/disgaea_3_vita_trophy_guide.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_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 5192 bytes
SHA-256: 7e84dec3c5b7fa47395d60dc26e4e5d0c6fa273a218c79e2ffafec9a87018291
font_01_sfnt_off00010d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D34 12292 bytes
SHA-256: 22ada78ee1c7726e5e9a02bd21889a531ec0809e46a20772e769683dc774e53f