Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdc9190832347b2…

MALICIOUS

PDF

78.3 KB Created: 2021-05-06 04:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 750dae19f0271cb5460a4cafe948e0de SHA-1: cec953f5202c892ad884d5c4c2903e1706b18cf4 SHA-256: 2cdc9190832347b2d53cbd26240861c4e1f387735cdfd17e27c1692e12379b80
206 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 for 'Pdf.Phishing.Trojan'. It contains a significant number of external links, indicating a link farm or redirection mechanism. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and external links suggest it's designed to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

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.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://resalured.ru/strik?utm_term=zmodo+camera+not+connecting+to+wifi PDF link annotation
    • http://runmasten.online/banjaran_movie_ke_video_songnawwu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387427/normal_602179849125f.pdfIn PDF document text
    • http://mini-cam2.club/spesifikasi_minimal_adobe_premiere_pro_cc_2018wg521.pdfIn PDF document text
    • http://parrrtner.xyz/monivodoq5.pdfIn PDF document text
    • http://fruktovik.com/siwasigegabinumn928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446636/normal_6035352ac867a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_743afee2040646deb5ddf927ebfe8f96.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fbd748c-01b8-4559-af19-3bc6b2839772/what_is_a_strawman_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2b82fc7-aebe-45b0-85fc-51adc7e68f58/jinenap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f129cff3-3605-4362-955b-66a373bcaed0/brother_sx-4000_electronic_typewriter_daisy_wheel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89659f0a-9595-47f7-9345-bed6dc844e6c/dudoxoxetij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35ed8d76-0198-466b-97db-84968a6924b3/blackjack_cheat_sheet.pdfIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_2faf89f4632e40a8be1146c688ccd507.pdf?index=trueIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_205482d7ca114252922408bd7fde0773.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf971bc9-3ea4-457b-b8a5-8f5e46c758e2/milomujipisudoxugusak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4331d01-1925-47cd-87ca-482b0219913f/16218941554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7db2169-f2a7-407f-b831-956c528ad227/los_72_nombres_de_dios_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97be7dad-21a4-46c2-8695-4d4bfe014d71/sobajebulubovur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/340f2170-28f1-47f6-836f-cd07e48b2a57/hunger_games_book_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c0567c-5283-43ef-8273-00c031fbd49d/homedics_ultrasonic_cool_mist_humidifier_manual.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_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 5180 bytes
SHA-256: 084a8479589b2e46fd9053407384ec3886d660bc25736ec8c4b0331488f73f03
font_01_sfnt_off0001056a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056A 11236 bytes
SHA-256: 7c4f2af25f39d6dcd14438e155f7533d248d0b1770f33ed6e205a3e435b0c5ca

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