Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1d2dba809b5ed5c…

MALICIOUS

PDF

78.4 KB Created: 2021-05-09 04:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: af2e8c0f282a17369abb07929941ab4b SHA-1: ce14994837834499bbd2a19287c8ae537cec963b SHA-256: c1d2dba809b5ed5ce09e2a69536afb9a6a5f764cd4006b9ae0447dab5367f575
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or phishing attempt. The primary malicious URL identified is "https://gimoguvi.ru/strik?utm_term=is+duolingo+good+for+learning+russian", which is likely used to redirect users to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=is+duolingo+good+for+learning+russian PDF link annotation
    • https://cdn.sqhk.co/kewixoretuze/jcR8ZXl/ice_cream_truck_song_turkey_in_the_straw.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabudoxuwa/heFsXA2/87495037280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471945/normal_602c06515c146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383703/normal_5fe7499bef5b5.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/jcJ3etM/dewujomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466165/normal_5fdb86f9a0f05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_606545f171a1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375210/normal_600aa9435c420.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_17ed8f550e0448d0ab982fa74c5fa8c5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejados/6064120481.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/eviction_notice_template_south_africa.pdfIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_f848dc46faf64c3e9e81749820c65395.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/vetimubabojot.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/percentage_aptitude_questions_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/lerijopewu.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/42607780693.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/android_one_redmi_note_7_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/70497761812.pdfIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_9bee997241ef4484ade08d612a464fb1.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_8afe934be1f54acbab5243eae4f06d1b.pdf?index=trueIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_b835603b20c64704aba9336ec65e1164.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/posufij/how_to_program_att_directv_remote_to_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/microtype_4._2_mystery_puzzle_answers.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_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 5012 bytes
SHA-256: d6c5ff58a0470e6bb17a5dadd173d5bca45721b3140dc16ef18d0c37501cbd4a
font_01_sfnt_off0001054b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054B 11028 bytes
SHA-256: c5dd597c309c30467c8632e34f6c98bcc2d091070872599129c9f4198f750f58

Open this report in the interactive analyzer, or submit your own file for analysis.