Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c53256a69bdd400…

MALICIOUS

PDF

72.2 KB Created: 2021-02-05 12:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 07adde3a0376c48a7cd264595a0d84f0 SHA-1: 5291c5f549b7fe970f38aefabb5d444a526e9087 SHA-256: 4c53256a69bdd400f006803e28c8565c4c7c807abe66c94b3cd50818ccb4f054
226 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm attack. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to manipulate search results or redirect users to malicious sites. The presence of a link to a CAPTCHA-themed lure further supports a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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/123?utm_term=super+bowl+squares+2020+template PDF link annotation
    • http://prizinsta.online/wamiwebalimuboqfsd7.pdfIn PDF document text
    • http://fegudifo.22web.org/360_video_recorder_app_android.pdfIn PDF document text
    • https://nixujukasal.weebly.com/uploads/1/3/1/6/131636737/xifamavunujobabilo.pdfIn PDF document text
    • https://cdn.sqhk.co/pakelabete/cLheufV/daisy_bunny_looney_tunes.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/hFNjbih/wafavuvinubugidimi.pdfIn PDF document text
    • https://cdn.sqhk.co/dudazume/gdCNigF/puguwo.pdfIn PDF document text
    • http://requiredjokblog.com/gezemasudizapojarzzff.pdfIn PDF document text
    • https://cdn.sqhk.co/menigopas/cdbYgdR/food_lion_hours_thanksgiving.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/XjeXrjj/ps_vita_retroarch_roms_folder.pdfIn PDF document text
    • https://cdn.sqhk.co/lukapokobejo/ijbifia/bulurone.pdfIn PDF document text
    • http://opticsystem.website/1282415735860e5w.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/FVjhnW8/baixar_bloxx_craft_girl.pdfIn PDF document text
    • https://sivisobimiji.weebly.com/uploads/1/3/4/7/134754783/de2736b80fa7.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/marimejerebo/contact_form_7_captcha_not_showing.pdfIn PDF document text
    • http://rumavajusugeg.rf.gd/achyutam_keshavam_song_in_female_voice.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_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 5700 bytes
SHA-256: b32b3d007141dc4ecf3f555cf754925c4a881a866ac71dbe64cbd4c23d3b80c9
font_01_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 10632 bytes
SHA-256: 0ed54a844315dd882da4db93e4b2c033c7a0f76298cb47d29c0963924ddf40af

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