Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d1a126f190eee1…

MALICIOUS

PDF

76.0 KB Created: 2021-04-12 12:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 42354d2976d78279c1337bceb3d984a4 SHA-1: e400c6942b4558a1aef65bcc3638a5a917b85713 SHA-256: f7d1a126f190eee19a79da23431765e749be68ab61330a73e8347c4ffb3173e5
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services. One specific URL, https://crophysi.ru/strik?utm_term=zebra+zt420+label+counter, is flagged as a known malicious redirector. The presence of numerous links and a malicious redirector suggests this file is part of a phishing or spam campaign designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=zebra+zt420+label+counter In PDF document text
    • https://rilulozopofebu.weebly.com/uploads/1/3/1/4/131406258/bujemo-woxoribitasusa.pdfIn PDF document text
    • http://likefetevu.getenjoyment.net/donofegemowo.pdfIn PDF document text
    • http://kogemotuju.getenjoyment.net/army_regulation_headphones_pt_uniform.pdfIn PDF document text
    • https://kofaxikizija.weebly.com/uploads/1/3/4/3/134336932/0e55a47e3db96d.pdfIn PDF document text
    • http://suvolupijiro.mygamesonline.org/fimarodatapugetegiparixu.pdfIn PDF document text
    • https://jukusixod.weebly.com/uploads/1/3/1/4/131483076/8a02ac5a63a.pdfIn PDF document text
    • https://jejofiwapo.weebly.com/uploads/1/3/5/3/135312812/bewusowuruvedal-rujepeforinagi-gedapo-bezenori.pdfIn PDF document text
    • https://pagafika.weebly.com/uploads/1/3/5/3/135339488/kebazewunetafeloluno.pdfIn PDF document text
    • http://tokiridevifo.medianewsonline.com/electronically_sign_acrobat_pro.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/entrepreneurship_theory_process_and_practice_8th_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nijudow/dandelion_plant_information.pdfIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_c362713792574ead9ebc0aea1fe117f5.pdf?index=trueIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_ddb8adc380c648a1b15da41810a1eea1.pdf?index=trueIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_9232dd53fb9a4c6899e630e3bf750908.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/jifavero.pdfIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_6add2175ff5b466cb90fed620ec4db11.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_9a33187c7baf4c4ea6d21e5e0ba32eaa.pdf?index=trueIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_35a4b9aac006466b8ec9cd5bf03231fd.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_7b1d403e2bd5456993822198fb58382a.pdf?index=trueIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_b0d986e3d29c490c9fc22ebd7f00ace2.pdf?index=trueIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_029ab39e74164188b1dbf9ee004ce369.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_853100c71b9f4416a0c3534b6d7873ac.pdf?index=trueIn 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_off0000eb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB17 5124 bytes
SHA-256: 4e30178ea39a1280278083936084e6ff88522c1b63e0ea5fef02b37f0b11c46e
font_01_sfnt_off0000fc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9D 10836 bytes
SHA-256: db4059e359835e95039d157ab6ace0639988cafbe6294b76855e38ea7c5e61e5