Malicious PDF — malware analysis report

Static analysis result for SHA-256 5985f2bb3978681d…

MALICIOUS

PDF

73.3 KB Created: 2021-03-23 01:15:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 61e3764db4bc21200e8bc9e1fba15ce0 SHA-1: c8a90fda62cd8de1894585316cff59bad9912abe SHA-256: 5985f2bb3978681d52b28c4ba9a53cc9b16b07667bbd24310978d3c33bbeb9ea
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's likely a phishing or malware distribution lure. It contains a large number of links pointing to external websites, many of which are hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination or spread malicious content. The embedded URLs and the heuristic firings strongly suggest an attempt to redirect users to malicious infrastructure.

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/wix?keyword=csi+algebra+unit+9+answer+key In PDF document text
    • https://kexowepapu.weebly.com/uploads/1/3/2/8/132815076/6b3cd9ea7430a13.pdfIn PDF document text
    • https://dazafilitekanib.weebly.com/uploads/1/3/5/9/135977429/472f59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454179/normal_5fd3065bda9eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490132/normal_602144eebd2fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500201/normal_6005f5873c23b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424405/normal_605923bf10a99.pdfIn PDF document text
    • https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/xevoxutudadub.pdfIn PDF document text
    • https://lufukosiresefo.weebly.com/uploads/1/3/4/7/134707539/fiboretuboz.pdfIn PDF document text
    • https://murozukuzofapu.weebly.com/uploads/1/3/4/7/134716639/3885084.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475382/normal_5fe52ba148fb3.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/44b40dc9-eb16-437e-9520-ef7077ebc90f/75431016189.pdfIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_5d0f55c2428a4e48ab41d1e27c1094ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokudapele/whatsapp_free_for_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/022e6832-91f2-4ee8-b06c-a1267ad50149/does_the_devil_really_wear_prada_case_study.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/asus_z97_hackintosh_bios_settings.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_dce4314fb88d49c89dc45d8e16ad0dc8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba7b231c-d3a4-4718-b16c-3ed3e73c4b89/value_management_in_teaching_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/jikamogurilososekabunot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/123babe6-a2a0-449d-8bd0-6b9b8d7bcbe1/73692201287.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_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 5312 bytes
SHA-256: 2c9549fbd513269d465f7627cbc5db6f54de4647af99220d780b3dfbba75f042
font_01_sfnt_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 11740 bytes
SHA-256: 25481b4dd3c0748a54cfd30d2585e3948d1af988b3d831bfd787dc015676e485