Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ccc8456b5b8a7c…

MALICIOUS

PDF

102.3 KB Created: 2021-04-16 21:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 28341befcef4e6b4c79712e2b2b78505 SHA-1: 1ac062fcbf20efbcd8d1b17fb1955a682430e441 SHA-256: 73ccc8456b5b8a7ce2cb3000cb1e743775b140e8e6694dcea3a66dfe7041cb3a
284 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing and redirector link farm. It contains numerous links to external sites, including a known malicious redirector, and instructs users to disable security software. The document body, though heavily obfuscated, appears to contain keywords related to software downloads, suggesting a lure to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://yafferge.ru/strik?utm_term=fl+studio+12+free+download+64+bit+mobile In PDF document text
    • https://xuduzaximebawu.weebly.com/uploads/1/3/5/3/135315026/6147274.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/diary_of_a_wimpy_kid_rodrick_rules_book_summary.pdfIn PDF document text
    • https://zadukali.weebly.com/uploads/1/3/5/3/135340438/1203210.pdfIn PDF document text
    • https://rukadewij.weebly.com/uploads/1/3/4/0/134012321/715fa4a86.pdfIn PDF document text
    • http://rawenspant.online/tugifizdfkx2.pdfIn PDF document text
    • http://mon-cmb.best/xofusizakosodawofi2mt2j.pdfIn PDF document text
    • http://2020coupons.info/46636049008gbi4d.pdfIn PDF document text
    • https://jakoxizejibak.weebly.com/uploads/1/3/4/3/134348863/tawomo.pdfIn PDF document text
    • http://fajesamosini.sportsontheweb.net/characteristics_of_life_biology.pdfIn PDF document text
    • https://mexupapomumag.weebly.com/uploads/1/3/0/7/130775103/donuxuzisubiguwid.pdfIn PDF document text
    • https://poperetaro.weebly.com/uploads/1/3/4/8/134893078/jelejarudugeduv-loxurosetupefeg-gisatawilutuzel.pdfIn PDF document text
    • https://buvewetaki.weebly.com/uploads/1/3/0/7/130775635/rorodesupe-makuroj.pdfIn PDF document text
    • https://bawovaleza.weebly.com/uploads/1/3/2/6/132683088/9299011.pdfIn PDF document text
    • https://putebofodabisig.weebly.com/uploads/1/3/4/3/134368176/vubegapexabow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_60184a244a772.pdfIn PDF document text
    • http://delabozaxexiris.getenjoyment.net/mufekifelota.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/2513828.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487902/normal_6060ac8884019.pdfIn PDF document text
    • http://cmb-accueil.com/games_like_nancy_drew85pmf.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/b53cf78b-1f97-45b9-899b-6eaf79b202cd/shawshank_redemption_tamil_dubbed_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d406521-800b-4d07-bc0c-957a08ec2cf9/rezuxiruxoremusatesavav.pdfIn PDF document text
    • http://besafetusupug.atwebpages.com/44_phonics_sounds_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33891a1b-9ffa-41fc-8216-6767f9532623/disojixadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70848d5f-4f08-4de0-b557-4a8d6d6cc682/25900216793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0b68e8e-c90d-4ff6-8b11-203c8d2707b2/gatenikejupizidobu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F9 5664 bytes
SHA-256: 8aa39e421b058472b2b6544fc0a3f6a5f0837f4eee391bee9a6b09582f5edf81
font_01_sfnt_off0001493f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493F 13308 bytes
SHA-256: ac549659ea97b830c47701c5903ebf19541360c3329b00ab457fde067a2c403d
font_02_sfnt_off00017437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17437 16140 bytes
SHA-256: 3f83bbfb2e03141a9083badfb1da6e2b1773f9aa6b1ed8f30fc2d392a5ee3553