Malicious PDF — malware analysis report

Static analysis result for SHA-256 863852ac0fd1ca52…

MALICIOUS

PDF

79.0 KB Created: 2021-03-10 12:09:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 59c563b6b70f07600e8bee33886892ff SHA-1: b66bd6ae61086c2f3951e0ecb4016790056699bd SHA-256: 863852ac0fd1ca52e9e8dcaab8bf8711a409990d49ebf916b3f2204474c6200d
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting and redirector infrastructure, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious. While no scripts were directly extracted, the presence of numerous malicious links suggests an attempt to redirect users to malicious content, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=reported+speech+exercises+pdf+british+council In PDF document text
    • http://zimezobot.getenjoyment.net/tifewa.pdfIn PDF document text
    • http://pegijegur.mygamesonline.org/authors_purpose_pieed_powerpoint.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450356/normal_60178c28b50bb.pdfIn PDF document text
    • http://taranif.22web.org/acronis_true_image_full_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498994/normal_601123e71dd53.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/champion_4500_watt_inverter_generator_reviews.pdfIn PDF document text
    • https://roginolesalit.weebly.com/uploads/1/3/1/6/131636974/d2e4d8ac.pdfIn PDF document text
    • https://narapafugoziror.weebly.com/uploads/1/3/0/7/130775848/6290003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_6032c742845b9.pdfIn PDF document text
    • https://taduravepe.weebly.com/uploads/1/3/4/7/134714340/165264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403141/normal_600eb625b0ed9.pdfIn PDF document text
    • https://pedodexojur.weebly.com/uploads/1/3/0/7/130775447/2013805.pdfIn PDF document text
    • http://releterixorof.22web.org/agendas_alternatives_and_public_policies_kingdon_summary.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484997/normal_5ff4eade1958e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ef0e118b-2362-40f4-87c7-6526a32cd875/premiere_pro_tutorial_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f745865d-21ea-47e1-b759-e3de32a938c4/towodijeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53947c4e-a002-443b-ad07-de97cb70d484/62088069878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b4c26b8-7599-4c99-acbc-9615aa33d068/citadel_class_cruiser_deck_plan.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_off0000e8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 5128 bytes
SHA-256: 60b7d2982cec44104ef27efa85a6ceca6f623378bde671789d7aa89ea74789cd
font_01_sfnt_off0000fa2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 10628 bytes
SHA-256: 2b04c46f8c9c656d2fa24f8e3205ba59cc417d4216070669f4ec2d8d960f2e11
font_02_sfnt_off00011e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E73 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361