Malicious PDF — malware analysis report

Static analysis result for SHA-256 4618dcb92577141f…

MALICIOUS

PDF

78.9 KB Created: 2021-02-20 06:07:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 52eb3714b8152c22950dda17ee4fa249 SHA-1: d64cf8862a30ee47fd3debaba3197c39476e75d2 SHA-256: 4618dcb92577141fdb87dd52131e3a3ee56c600c62216d8b52f7814552fb8bfe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with one prominent URL pointing to 'baarspo.ru'. Heuristics indicate this PDF is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://baarspo.ru/123?utm_term=how+long+to+get+a+purple+belt+in+jiu+jitsu PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410975/normal_5fea08846bccc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368485/normal_5fef0c186a172.pdfIn PDF document text
    • http://fitness-ital.fun/kofaxowisawibegad9esvc.pdfIn PDF document text
    • http://repair-foto.ru/366444634611x1dx.pdfIn PDF document text
    • http://tipografiyav.moscow/trauma_blood_transfusion_guidelineslviay.pdfIn PDF document text
    • http://hydrofthol.space/aymane_serhani_songsabxss.pdfIn PDF document text
    • http://mini-cam1.club/game_champions_manager_mobasaka_mod_apkl08a0.pdfIn PDF document text
    • http://aov.one/85631637944znw23.pdfIn PDF document text
    • http://runolive.com/cracking_the_coding_interview_6th_edcwbgd.pdfIn PDF document text
    • http://pifafuvutote.iblogger.org/47672383276.pdfIn PDF document text
    • http://uscarinsurance.info/zomasazumusavuj8z96t.pdfIn PDF document text
    • http://opensalle.xyz/perobezewepuronaplxob.pdfIn PDF document text
    • http://bigwin-1xbet.fun/bts_airplane_pt_2_japanese_songx8wc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vumesurev.epizy.com/aromaticity_worksheets_with_answers.pdfIn PDF document text
    • http://bomigezi.epizy.com/evenflo_symphony_car_seat_booster.pdfIn PDF document text
    • http://besoxumewube.epizy.com/android_screenshot_power_button.pdfIn PDF document text
    • http://zoxuditavuvov.rf.gd/77842690884.pdfIn PDF document text
    • http://pekesapawej.epizy.com/jefetoje.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_off0000f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 5256 bytes
SHA-256: 3db786e38407662869944b5febcb99e50787e47efb456189a1ece430be3463cc
font_01_sfnt_off00010a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9D 10460 bytes
SHA-256: 3d4da8b52c1ef2bfe820036c5728a55e8dc679e139a4ffadaab588507c42d052

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