Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee2b67358c99d29f…

MALICIOUS

PDF

79.7 KB Created: 2021-05-28 21:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1afbf037ca7d50e4ea2cbd9d4962eb58 SHA-1: bb2c3b2c786b3665b497de3b11571c0faa8ef4b0 SHA-256: ee2b67358c99d29f1e7c692be1a3c34d537921a041e0194109108c26a7dda0a7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing or scam campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://resalured.ru/strik?utm_term=how+to+use+hydrasense+baby+nasal+care+easy+dose PDF link annotation
    • https://zimuwinosozenuj.weebly.com/uploads/1/3/0/7/130740464/rapuwigu.pdfIn PDF document text
    • https://zapilututok.weebly.com/uploads/1/3/4/3/134341349/wajawezuxizizub.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403688/normal_5fc713edd448d.pdfIn PDF document text
    • https://wakokozetu.weebly.com/uploads/1/3/4/3/134307835/nupopolagadunon_mikix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481055/normal_5fd8966c26398.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475208/normal_6063e6d28cda5.pdfIn PDF document text
    • https://tivufele.weebly.com/uploads/1/3/4/6/134615601/fbacce66ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460241/normal_60344ce05e6f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375694/normal_606caf151a264.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/352734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402956/normal_602209c782052.pdfIn PDF document text
    • https://goxapixexaze.weebly.com/uploads/1/3/1/6/131607486/43d1288816473e.pdfIn PDF document text
    • https://ruvawigalovenu.weebly.com/uploads/1/3/4/3/134318686/4893473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380392/normal_60635cc361caa.pdfIn PDF document text
    • https://jusunusimonaka.weebly.com/uploads/1/3/4/7/134717465/663846.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e00b42c-15b2-41ed-b4ea-117577a7f750/summary_of_animal_farm_by_george_orwell_in_200_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/211528a7-a7cf-48e2-bfe9-a15a3d3cf89e/dell_optiplex_9020_mt_i7_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5a3667-376c-4751-940a-82a33599c7cf/gevinamarawusop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29bf1fd8-4f85-4451-a003-f57adf732b56/81199969722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7335b96-deca-4d92-b73b-f9b8e167c083/dukeralab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d162d35a-f25b-43bb-837f-52b022178517/68455199727.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0077489-11e4-480c-b615-c9d57a1356d2/fevomazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62483a38-badd-4ae7-b3d0-36e3e7aa3a74/44924377291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ee32e08-6d40-44d1-9072-6c69096db378/tp_link_range_extender_access_point_setup.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_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 5324 bytes
SHA-256: df02fe4e5e3764db9efe01170343486d284b1172e1fed3f9552abef868ffd77c
font_01_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 11364 bytes
SHA-256: 718d4dddc3dc034c8a85f86bdb6294268a5ff514cde39be38575b323a0adcafb