Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfd8a3f5b804f86…

MALICIOUS

PDF

77.4 KB Created: 2021-05-28 10:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2499853272b752a6d95ff9881efdb553 SHA-1: ba281c41aff6d7473506c650ac56ca4e33c979a3 SHA-256: 1cfd8a3f5b804f86b546a7f73cc28f5b862bc8f61514293d35a83ca3bc02f691
226 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains a large number of external links, many of which are disposable or lead to potentially malicious content, suggesting a link farm or redirection strategy. The presence of 'cmd_is_not_opening.pdf' in the document text hints at a potential attempt to bypass security controls or disguise malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=illegality+in+contract+law+pdf PDF link annotation
    • https://vuloribogisoso.weebly.com/uploads/1/3/4/6/134655424/vakimubarepanen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384484/normal_603960b5d652e.pdfIn PDF document text
    • https://tusagenitig.weebly.com/uploads/1/3/1/4/131452801/penivugasoveri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388162/normal_5ff16278d57b7.pdfIn PDF document text
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/degerasukuk_sapewapuvuzata_tojebijev_bawejubejokuw.pdfIn PDF document text
    • https://migobajiker.weebly.com/uploads/1/3/5/3/135390735/98eed3836.pdfIn PDF document text
    • https://wisixujedos.weebly.com/uploads/1/3/4/7/134732494/cc937742f46.pdfIn macro / runtime command snippet
    • https://jatekowi.weebly.com/uploads/1/3/0/7/130776123/badut_fujemezuzori.pdfIn PDF document text
    • https://tadafemuge.weebly.com/uploads/1/3/4/4/134480681/tututesajifikenas.pdfIn PDF document text
    • https://jujarodi.weebly.com/uploads/1/3/4/5/134507231/pefogedofeg.pdfIn PDF document text
    • https://xurepisex.weebly.com/uploads/1/3/4/7/134718841/6924952.pdfIn PDF document text
    • https://rofunepez.weebly.com/uploads/1/3/2/7/132710772/tilukojarojesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445729/normal_602e5ef887058.pdfIn PDF document text
    • https://vekafikag.weebly.com/uploads/1/3/5/9/135986004/7424793.pdfIn PDF document text
    • https://vixoketos.weebly.com/uploads/1/3/1/4/131453026/6480830.pdfIn PDF document text
    • https://migobajiker.weebly.com/uploadIn 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/9fe30967-409e-4187-825a-fe93b9d5e5f1/ingredients_in_dunkin_donuts_iced_matcha_latte.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dce6509-83cb-4bf1-8ed5-f436041b754f/gibavegoxanovebutujedigi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb440368-e07a-4b40-90a1-6d3f7f03c906/why_cmd_is_not_opening.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f793e8a-5bd7-4ffb-8d42-a82418afb071/canon_mg6320_error_code_b200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4394950-1ed2-48b2-b08e-35b61d61f6fd/romeo_juliet_movie_all_actress_name.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_off0000eedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDF 5276 bytes
SHA-256: 8edcd70ed393a9c3992dff396ae61d10381873e4679b88569ec2b8805f9d3516
font_01_sfnt_off000100fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FE 11032 bytes
SHA-256: 8c0c1f06c9e9f883125b5ed88784845ea72c02739a851151d823f19c440c0d20

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