Malicious PDF — malware analysis report

Static analysis result for SHA-256 600fd2003f3f9d1b…

MALICIOUS

PDF

101.5 KB Created: 2021-06-06 18:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 692933b0c07b7fbde04045a2bba3bba0 SHA-1: 648abb9222b82ef2ec74ff9f9ff2f3850e855695 SHA-256: 600fd2003f3f9d1b2efc4351f7d1808ebfc990f89a9db14b82a690302c9e53c0
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The presence of 'powershell_version_5_download.pdf' in the document text suggests an attempt to lure users into downloading malicious PowerShell scripts. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://xajibur.ru/123?utm_term=13+eyewitness+news+houston+reporters PDF link annotation
    • https://biweworu.weebly.com/uploads/1/3/4/5/134525234/tozenobu.pdfIn PDF document text
    • https://josodurug.weebly.com/uploads/1/3/5/3/135394296/xipomimibog.pdfIn PDF document text
    • https://xaranetudu.weebly.com/uploads/1/3/4/0/134016810/mikomozafet_pebom_zilarujuzag_butomolorer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446773/normal_605846caa9c92.pdfIn PDF document text
    • https://xakuwije.weebly.com/uploads/1/3/4/3/134340554/maboforav_favafijexofu_tosijexasob_sojib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485693/normal_5fd66fbc06661.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446285/normal_5ff8239c42278.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4402247/normal_5fd32e3e9ff33.pdfIn PDF document text
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/4083956.pdfIn PDF document text
    • https://pukibasobudez.weebly.com/uploads/1/3/1/3/131379944/1231939.pdfIn PDF document text
    • https://zanelonovubut.weebly.com/uploads/1/3/4/3/134315015/6a32a85c161120.pdfIn PDF document text
    • https://cdn-cms.f-static.nIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a830f33c-6292-4fc9-851e-7ebd3628e46e/nuguved.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/535e1d59-9663-454c-8988-3dc16840ce06/windows_server_2012_r2_powershell_version_5_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/176c4e1e-1605-41ea-b1f7-455aaeac39fd/junopalixivivozurifi.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_off00014f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7B 4980 bytes
SHA-256: f8c2cd8b5a253a2d8415e6c01130e9fe346e35a0bae9aeca2fc727f22efdbd7c
font_01_sfnt_off00016086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16086 11880 bytes
SHA-256: 8c1d9ae7f2431cdaba3ad5d34c2d2458fb9a8095c043750859639b6834205f21

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