Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e4dccdf8509811…

MALICIOUS

PDF

79.5 KB Created: 2021-05-23 11:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6d1bf4eb89569f0c7d0d983e35a33089 SHA-1: ce31d3784a9ae568a5b172b3210c488826181b6c SHA-256: f5e4dccdf850981166113eb0c9dd78f8caae82d56f01c103c75f55f33cbb1738
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file exhibits characteristics of a phishing or malware distribution lure. It contains numerous links, with one pointing to a known malicious redirector, and another heuristic indicates a browser extension installation lure. The ML classifier strongly flags this as malicious, and ClamAV also detects it as a phishing trojan. The document's primary function appears to be directing users to external sites, potentially for credential harvesting or further malware deployment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://dafemum.ru/strik?utm_term=how+to+create+a+work+schedule+in+google+sheets In PDF document text
    • https://wevinavuligi.weebly.com/uploads/1/3/4/5/134505150/kawaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383449/normal_5fcf200d22122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496391/normal_60483f86b0bd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393485/normal_6023f86d47bf9.pdfIn PDF document text
    • https://funugunuxu.weebly.com/uploads/1/3/4/3/134384448/jutiwutunuwoxolutun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409239/normal_604e5ef4ded1a.pdfIn PDF document text
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/nalenowiziwaxe-suwavoxene-mudexiraxuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387582/normal_60012926dd76e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_606b4d3b73205.pdfIn PDF document text
    • https://noparerekum.weebly.com/uploads/1/3/4/6/134639333/60ffaa5.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/narerifamikot-nakile-zegazupijuvu-soxonefe.pdfIn PDF document text
    • https://padomixuboji.weebly.com/uploads/1/3/4/5/134527159/terinigarexo-gudubat.pdfIn PDF document text
    • https://jofanota.weebly.com/uploads/1/3/2/3/132302765/dca37c533f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_60184aea7dda5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_604719038baa6.pdfIn PDF document text
    • https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/runageg.pdfIn PDF document text
    • https://mejotozoferu.weebly.com/uploads/1/3/4/8/134866749/93098c7c2ca864f.pdfIn PDF document text
    • https://karopudalel.weebly.com/uploads/1/3/4/8/134881347/mokoxuga_rezezilo_pazuvadiz.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/e2675ea0-4f50-400e-bda8-154d29184b7e/how_do_i_put_music_on_my_ipod_nano_without_itunes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b5dea06-6dc7-40e1-a73d-8727afc95475/93867192665.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/free_vpn_for_chromebook.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/napatir.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/avidemux_free_fosshub.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/aradhana_malayalam_movie_songs_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10bbbf3a-b6f7-4a1a-b4b3-73936ca9ad4e/feminist_epistemology_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15cc4f43-e31c-4421-86f6-69f0da078c94/21415528293.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_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 5320 bytes
SHA-256: c4160813b1df0b8c86cd150f5db6928253e0ca26eadd3e08116eeaa4d2eac270
font_01_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 11560 bytes
SHA-256: 0417cb7c66c65e4eebe11c03cc7d65aa9f99a2b1b08ba126bacfaeb709786329