Malicious PDF — malware analysis report

Static analysis result for SHA-256 f069c46cdb8d511d…

MALICIOUS

PDF

77.3 KB Created: 2021-03-05 08:57:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c1c3ebf5f09aff00c80f6c77c688cc44 SHA-1: ccbdf1a92fe4ed79a7e3c1fe9bd32859dac26fe7 SHA-256: f069c46cdb8d511d9ac2b513a7de1e93ce19d7f7dca6713c2e2e6d58365060f9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to distribute further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://jottigo.ru/award?keyword=the+great+hunt+grand+tour+island PDF link annotation
    • http://gutprod.xyz/how_to_play_football_board_game_with_dicehjcoi.pdfIn PDF document text
    • http://giocodigital.space/63225202090666c5.pdfIn PDF document text
    • http://dalexepegubidi.iblogger.org/ccna_2_exam_answers_2018.pdfIn PDF document text
    • http://ashotik.space/tutu_app_not_ing_2019ey7rq.pdfIn PDF document text
    • http://montana-media.com/lagozurodegowimek3sv9t.pdfIn PDF document text
    • http://toppiksnack.xyz/niv_application_commentary_exodusqrxun.pdfIn PDF document text
    • http://milansit.space/whatsapp_status_viral_video_tamil_download_2020kr9l9.pdfIn PDF document text
    • http://testrun.ru/3290372999vb2oy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://posugez.epizy.com/brand_new_day_the_wiz_sheet_music.pdfIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_07cd6b4b0e43484c96f843c57c6ca3d6.pdf?index=trueIn PDF document text
    • https://5e20aa6b-77ef-4f11-9344-5454fb7c649c.filesusr.com/ugd/fb3aa9_481c0631048048f58cf374074a747a3e.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_cf45ad66a4c3492281eebae26c5f118c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/gigabalexefelezox.pdfIn PDF document text
    • http://disupenepoka.epizy.com/saucony_men_s_guide_iso.pdfIn PDF document text
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_f71c13835ab8438aaebf5348bba89c39.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_d2ff35d63df740b8929115c74746892e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/cccam_server_hack_elbeyli.pdfIn PDF document text
    • https://6d428a25-da86-44fa-8f13-5b0f09742281.filesusr.com/ugd/3649d2_b2364135fbf6445bab31407206088262.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nowonovege/likert_scale_questionnaire_template.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_e030b2459407405e848c6df8c7a4e0b9.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_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 5036 bytes
SHA-256: 76ec4f1d9f2c27acaaf8024a99bd33edf8ad2f49cc393897fe9380cbcdb97ecd
font_01_sfnt_off000104f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F9 10252 bytes
SHA-256: 5fd7b5fce6fc8e0e5f208e419f37a01e7c77462d41f571a7956bc5d91b591273

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