Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda06b5b632cf36b…

MALICIOUS

PDF

74.0 KB Created: 2021-02-28 18:18:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 962294705c66f178b249333aa227da4e SHA-1: 57cf72059bd1fbfa61c6914557d1169e4b9bd530 SHA-256: cda06b5b632cf36b639a8d74d2320fae8a1e40aa6ecc52eb40f973b648da570f
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs and the PDF structure suggest an attempt to redirect users to external sites, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://druttle.ru/wix?keyword=gilded+age+webquest+quizlet PDF link annotation
    • http://hotita.fun/75405339863u8nwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426955/normal_6016d570c2db2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_602291638d6ef.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/agHNZjh/mijuwezowakeb.pdfIn PDF document text
    • http://duboxol.iblogger.org/ruhs_bsc_nursing_exam_form_date.pdfIn PDF document text
    • http://jexujililizatub.22web.org/27587641470.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/RCkheZG/32884967660.pdfIn PDF document text
    • http://mewibapevuwado.22web.org/diruvuzogokojazomebotido.pdfIn PDF document text
    • https://cdn.sqhk.co/kuderoxuz/bjegihf/guide_for_zooba_zoo_battle_arena_ios.pdfIn PDF document text
    • http://persequen.com/zoxugu7xbi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485703/normal_603ad1b159d86.pdfIn PDF document text
    • http://1yamal.space/29328064896wbm3j.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/VgggOjj/52001232063.pdfIn PDF document text
    • http://cmb-accueil.com/220652980371mlwn.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/povelenavuviw/answers_to_crossword_quiz_underwater.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/pibodutewupomanedu.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/bufeti.pdfIn PDF document text
    • http://zefexulipovi.rf.gd/anganwadi_form_2019.pdfIn PDF document text
    • http://suvowafavij.epizy.com/naruto_obito_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/jobutipigupunose.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_off0000e5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B4 5336 bytes
SHA-256: 6f15818beaf067abfe07d5e9d0a4cd324d248f3434a888473103f56ca1563379
font_01_sfnt_off0000f801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF801 10108 bytes
SHA-256: 1cc198ddeb332414d20f1445007ad42e348bdff273cf8b9ca2a7266f4a44a127

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