Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46b24f7f730dab6…

MALICIOUS

PDF

80.6 KB Created: 2020-12-25 02:12:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2e8b6f558eac386ece534d20da6899c8 SHA-1: e55f085da5b9021eeb5a3847d76cc398ca5cdbcd SHA-256: b46b24f7f730dab6a41a0255d28b886c074c21613d16b185cb7a5e9e80a7be72
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a redirector to a known malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous links to potentially disposable hosting services suggests a link farm used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://gettraff.ru/123?utm_term=tax+topic+152+no+bars+2020 In PDF document text
    • https://zomerasojukoluw.weebly.com/uploads/1/3/4/7/134769652/3528618.pdfIn PDF document text
    • https://vaxulazazoju.weebly.com/uploads/1/3/4/5/134587837/477524ae960a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_5f8ff79946c9a.pdfIn PDF document text
    • https://wufenimikefi.weebly.com/uploads/1/3/4/3/134366244/liwos_dewulejuxus_kovelibexuna_negidamarodu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379030/normal_5f94640bdd211.pdfIn PDF document text
    • https://jatokogeredere.weebly.com/uploads/1/3/3/9/133997843/torogikijavu.pdfIn PDF document text
    • https://mejodulifewu.weebly.com/uploads/1/3/4/5/134526208/6564366.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/624ca9c3-969e-4486-a734-a9a6908fa90b/45005689213.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bc4168e-7348-4017-a2c9-bac19ff6edb4/11035087363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/578ac7b5-dc9c-44ef-8fa8-7c9a1979e99f/wijet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f6b088-51a5-416a-8ef0-5648ce8da200/staying_sober_by_terence_gorski.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/venous_lymphatic_malformation_neck_ct.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18792bec-ea81-40e4-8e5a-7d5f5ea65e9a/lsac_gpa_calculator_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/durham_bulls_schedule_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cb60ade-c4e3-4b25-baf0-a4b12ef9d3d4/unblocked_minecraft_noodlecade.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 5500 bytes
SHA-256: 0f7036fe103b4723ea3b3a0b70f2a0992e5b772e65617d64364cd4b1dc51aa8a
font_01_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 1820 bytes
SHA-256: cfe7dcfa4a078a256f3971bef0c58835e76535ba0126e65f3bae9507ae2437e0
font_02_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 11328 bytes
SHA-256: 0803f92c912d0f68d0883b2d06ecc8854c2dfc67649b59b288df19f92a9ae290
font_03_sfnt_off00011c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C58 17112 bytes
SHA-256: 63a31b111ded87e946caf1d12d41f1d8f4f40a39d556fff3c519c5da9399965d