Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb91441f08c39a8…

MALICIOUS

PDF

79.3 KB Created: 2021-03-15 14:54:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 998e9a50665e6771df3f5f604e0d5d83 SHA-1: 7ccf35f56bf907313ed1dcc5dac134462de37e02 SHA-256: 1fb91441f08c39a85eaab295c5cdb4d761cc0bf2d97a063b1f57097863eac6ff
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it's a phishing or trojan delivery mechanism. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. One critical heuristic indicates a direct link to known malicious redirector infrastructure.

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
  • 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.
  • 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.
  • 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/strik?utm_term=behind+the+scenes+of+star+trek+discovery In PDF document text
    • https://vomizovuzib.weebly.com/uploads/1/3/1/6/131637161/2260251.pdfIn PDF document text
    • https://rakafofolobe.weebly.com/uploads/1/3/4/6/134649319/kijezevil_pupufam.pdfIn PDF document text
    • https://ludekomu.weebly.com/uploads/1/3/4/5/134505051/1894780.pdfIn PDF document text
    • http://zusagukitu.mywebcommunity.org/garmin_62s_manual.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/mipewujelepifoturakurap.pdfIn PDF document text
    • https://jetisinodab.weebly.com/uploads/1/3/5/3/135335938/miwumib-seguvifigufu-lijaj-bitagabazoto.pdfIn PDF document text
    • https://fibukumaguwin.weebly.com/uploads/1/3/4/7/134770434/garoxa.pdfIn PDF document text
    • http://kuroramogesok.iblogger.org/windows_powershell_step_by_step_free_download.pdfIn PDF document text
    • http://wiwajekirutiw.scienceontheweb.net/fitifizudufulawigoxo.pdfIn PDF document text
    • https://migirebunimalab.weebly.com/uploads/1/3/1/3/131383914/6457289.pdfIn PDF document text
    • https://lakogobeza.weebly.com/uploads/1/3/4/0/134096968/7934488.pdfIn PDF document text
    • http://wopuxefisov.iblogger.org/35537568255.pdfIn PDF document text
    • http://wudebakafepi.mypressonline.com/how_to_run_c_program_in_android_phone.pdfIn PDF document text
    • https://uploads.stIn 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/8265099c-16e7-4662-afd4-3658364c026e/37655773275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78780d4e-7c4c-4525-9a1e-cc03d9adb625/1632718301.pdfIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_ab8de4e9c6294c5ead323cf767a5e32b.pdf?index=trueIn PDF document text
    • http://toratolobojede.rf.gd/manual_j_residential_load_calculation.pdfIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_7703a7adc44c485387d12a8dd93a3a18.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_ae4942a27ecc4690898b66458b130d6e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/107f0755-4269-4186-a921-7372bb87124c/816483792.pdfIn PDF document text
    • http://bofepojiwo.rf.gd/68001972034.pdfIn PDF document text
    • http://jetizugig.epizy.com/klikorka_obecn_a_anorganick_chemie.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_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 5352 bytes
SHA-256: 1e757c629372e7c57066a382077e5d8e535d7995c00a41089e208e2e0cc3a669
font_01_sfnt_off00010aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAD 10960 bytes
SHA-256: feb6f6b43ac9bbbefc60c2d2d9b11d1f4964eed23f75cc58d495920928f9c342

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