Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e032d2d6db8f32…

MALICIOUS

PDF

66.8 KB Created: 2021-02-11 03:23:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c6209c092e701ddb91efc3f879aeba65 SHA-1: 218637e521ed0e399f2fbfa5931a94d61b9848a1 SHA-256: 76e032d2d6db8f327cf7712d88f46ac2206b732f7ca054e24af74cd39d05d537
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true destination or host a large number of lures. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly suggest a malicious intent to redirect the user to a harmful site.

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://jacksth.ru/123?utm_term=krups+waffle+maker+f654 PDF link annotation
    • https://cdn.sqhk.co/kululojilo/7ETPLVr/game_dev_story_combinations_unlock.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/fAgg5ia/best_virus_removal_software_for_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_60246d3cd7b38.pdfIn PDF document text
    • http://vbruti.site/77920404334sbl3i.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/heGjaha/voa_news_radio_online.pdfIn PDF document text
    • http://pannochki-art.com/soviet_national_anthem_alto_sax_sheet_music0i7fr.pdfIn PDF document text
    • https://cdn.sqhk.co/duxapotor/gfjggfR/best_first_strike_paintball_guns.pdfIn PDF document text
    • http://english-10.site/paul_dawkins_notes_differential_calculusx19k7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490375/normal_5fe32e6a6e6e6.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/fajonubinomeder/34135840586.pdfIn PDF document text
    • http://sunoxif.rf.gd/90388836838.pdfIn PDF document text
    • http://beduxivofobi.rf.gd/free_fire_battlegrounds_grtis_android.pdfIn PDF document text
    • http://dadorisisewane.epizy.com/giwuf.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/american_truck_simulator_mods_free_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/33491249596.pdfIn PDF document text
    • http://kizuwopo.epizy.com/7th_grade_inequalities_word_problems_worksheet.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_off0000c5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DC 5540 bytes
SHA-256: 3805af80f9e775553112806de4ef201db4a32cc6f3a3e1ab7a71352d457a5538
font_01_sfnt_off0000d8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B7 11180 bytes
SHA-256: 63bdc0309d6234a5779b03d55f78976eb6a0da530872899a0eac6ed4accce26a

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