Malicious PDF — malware analysis report

Static analysis result for SHA-256 5384fa1505e29edd…

MALICIOUS

PDF

103.6 KB Created: 2021-03-23 05:22:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 111eee79b5d21daf6cd6899ad18847ca SHA-1: 9ccdbe3ad594d7d25e685a3e4a4d4ae284f2f7a3 SHA-256: 5384fa1505e29edda8a7be74a58f0571fa741b284a08089cdc00ab8299b0056b
194 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 multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO poisoning tactic. One of the embedded URLs, 'https://jumiwimov.ru/123?utm_term=kwanzaa+kinara+template', is likely used to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/123?utm_term=kwanzaa+kinara+template PDF link annotation
    • http://wopuxefisov.iblogger.org/chelino_boogie_car_seat_manual.pdfIn PDF document text
    • http://francobusiness.com/bengal_tiger_tamil_full_movievxgcu.pdfIn PDF document text
    • http://konsalting.info/pg_medical_entrance_exam_questions_and_answersstgif.pdfIn PDF document text
    • http://shoop-fl.ru/viwufelumugikafujer3xm5.pdfIn PDF document text
    • http://forisawidokomor.sportsontheweb.net/jufovovetefakabiruzuni.pdfIn PDF document text
    • http://derapom.iblogger.org/soil_arthropods.pdfIn PDF document text
    • http://vwwv-avito.online/192741441258ovap.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/kegubinefuda/sinhala_cartoon_video_3gp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9760ab51-828b-4a12-ac67-6155cd703fdf/lumiwegus.pdfIn PDF document text
    • https://s3.amazonaws.com/zubata/nimonexitimeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ece468ed-0ee1-4846-95f5-d478fd44c1a3/simmons_sd1000_review.pdfIn PDF document text
    • http://dudulexo.epizy.com/31262457887.pdfIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_ebff52d7e81c44899d87bc9c55abf36c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/64ad33c2-648a-4e59-bfd3-6823011260fc/how_much_is_an_igniter_for_a_gas_oven.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/accounting_dictionary_oxford.pdfIn PDF document text
    • http://wisunomimat.epizy.com/types_of_stem_cells_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/760957d5-2770-4137-84fc-82cb53d940e8/39859837223.pdfIn PDF document text
    • http://jufofokisib.epizy.com/sifibodiximege.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/employment_news_app_for_android.pdfIn PDF document text
    • http://sujunutab.atwebpages.com/easy_commodores_piano.pdfIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_d7772fa60ded4694bf4e73814fd6e5a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2571419b-1deb-48e9-81db-1700c3612431/3444925886.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 34552 bytes
SHA-256: 5e5cbc0f0f6814584380aa9ad0af766f7b9103f2b68dcd0cf69ad0a1a662946c
font_01_sfnt_off0001592e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1592E 4964 bytes
SHA-256: 546eaef39020a23421c34dfc34d024b59f359184a6be7ca2eb7c49f01d5e96bb
font_02_sfnt_off00016a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A14 11144 bytes
SHA-256: e933d9dc5d94aba84cc3638b344f909fbf419c13b981bc014d619a7a1c1aca08

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