Malicious PDF — malware analysis report

Static analysis result for SHA-256 021ffd5ec528d566…

MALICIOUS

PDF

72.3 KB Created: 2021-03-02 10:00:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 00807e486723820f31cb3c8f46693102 SHA-1: 4196f7b47d49b9e23a92ed48526f3b96f4de2b4e SHA-256: 021ffd5ec528d566809d5558816140625f67a3e2954267de5f93875aad5657db
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://seumenha.ru/wix?keyword=watch+the+purge+online+free+dailymotion PDF link annotation
    • https://cdn.sqhk.co/ragekasa/fhb1NXd/bejexurarevodelamupowi.pdfIn PDF document text
    • https://zepinimokibe.weebly.com/uploads/1/3/4/3/134373719/3012ea3b6570fa.pdfIn PDF document text
    • http://kazexajisodibu.medianewsonline.com/youtube_christmas_carols_silent_night_lyrics.pdfIn PDF document text
    • https://kevafesituwa.weebly.com/uploads/1/3/4/0/134040773/vesufofetanufulu.pdfIn PDF document text
    • https://fuvenaxumegiga.weebly.com/uploads/1/3/3/9/133999500/duguroviriri.pdfIn PDF document text
    • https://sirewuri.weebly.com/uploads/1/3/5/2/135298631/5998186.pdfIn PDF document text
    • https://popetebebulexu.weebly.com/uploads/1/3/4/3/134316921/lolixikuwimorewewow.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/gdgg8pV/medieval_games_pc_mmorpg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_5fd7ee7cb5863.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/fQjdggD/visit_center_city_philadelphia_shopping.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/pl_sql_developer_tool_tutorial_for_beginners.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417138/normal_5fe3c95303812.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bagugexasorip.myartsonline.com/nezigufilomap.pdfIn PDF document text
    • http://suferipuwa.epizy.com/game_controller_for_android_phone_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/anova_one_way_and_two_way.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/java_64_bit_windows_10_update.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/zoladosukojurevitisobas.pdfIn PDF document text
    • http://fajazimigig.atwebpages.com/how_to_fix_air_conditioner_leaking_water_outside.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/reading_comprehension_worksheet_2nd_grade.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_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 5504 bytes
SHA-256: 0558a0af831c079c82b898d618adbcfd7232ec2087358d289eec08a775b0f364
font_01_sfnt_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 10504 bytes
SHA-256: 4c4b61a08e14ddea425593192e3b1e84b9211405b292b313ae7640c0908a5d81

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