Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb9567bba6becce…

MALICIOUS

PDF

87.6 KB Created: 2021-01-18 13:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d8062bfd6f00a46f755e5c75d797bbe7 SHA-1: 7a9b3da20c9c8e28571e04d32616fd71b956c876 SHA-256: 3cb9567bba6becce86e741f112b5f652428267a4095bc7deb27f5edd36819240
186 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, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/123?utm_term=ark+beginners+guide+to+taming PDF link annotation
    • https://cdn.sqhk.co/wudawagirus/djijihf/60773975485.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5f8cb3707a347.pdfIn PDF document text
    • https://bugadubotureje.weebly.com/uploads/1/3/4/4/134468403/wusogavekutawaximi.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/iaXCj36/fists_of_fury_achievement_witcher_3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384301/normal_5fcecf27b50fb.pdfIn PDF document text
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/rexen.pdfIn PDF document text
    • https://towowiwegopute.weebly.com/uploads/1/3/4/0/134019464/nelefapax-ditebijolejobaz.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/jjfXJjc/luwefaretaxumo.pdfIn PDF document text
    • https://notokawuwo.weebly.com/uploads/1/3/4/8/134856920/b89071fb9c1.pdfIn PDF document text
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/nuxal.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzifixe/ahbPzhw/7585704307.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/fejakixoweka/nasonusulal.pdfIn PDF document text
    • http://furofazitogo.epizy.com/allstate_pip_application_form.pdfIn PDF document text
    • http://lojetewope.epizy.com/cell_cycle_regulation_worksheet_answer_key.pdfIn PDF document text
    • http://rujemivegelap.epizy.com/microsoft_excel_test_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/jujidiwudi.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/adobe_audition_cs5_portable_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 5308 bytes
SHA-256: 802460dd178eaab5c718f5bd49bcbd34ea9f5704e444f5c3345ac654efdd325a
font_01_sfnt_off00011770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11770 10652 bytes
SHA-256: ce6739e9f6e820255a0f4edbf8e138ddc6ca77b48d0e93d109f998e22283f098
font_02_sfnt_off00013bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF4 16140 bytes
SHA-256: 9cda5f9d0d1ade2bb157be125751fbda5965ae802dc2589f8455e8f0ceb63da1

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