Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5b09cd439188a9…

MALICIOUS

PDF

79.1 KB Created: 2021-04-27 06:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3ccb675196bfaf4d8d2f3b2f7be5aa31 SHA-1: 9a8697d9a42ac3cca1de8563d2c957350f32add2 SHA-256: 2b5b09cd439188a9b845635d6b35dafb5a04bfa88ec81f984ce6615644e82f22
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'pelibifir.ru', suggesting it functions as a link farm to distribute malicious content or conduct phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using disposable hosting for numerous links. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=fender+mustang+lt+25+amp+models PDF link annotation
    • https://cdn.sqhk.co/jalotenabo/poiiGPt/45042855661.pdfIn PDF document text
    • https://jasadugo.weebly.com/uploads/1/3/5/3/135341750/xoninijavuze-zobujifojes-supur.pdfIn PDF document text
    • http://dihtyar.online/32596325287byslh.pdfIn PDF document text
    • http://nat-fru.space/fonewelivitofimamijagebivd6yqc.pdfIn PDF document text
    • https://misapunuzure.weebly.com/uploads/1/3/1/6/131606411/4896409.pdfIn PDF document text
    • https://cdn.sqhk.co/juvowisire/Sihcpbm/hollow_ball_silicone_mold.pdfIn PDF document text
    • http://copyrightsupporteds.com/when_we_disco_duet_with_sunmi_j.y._park_lyricscxr6f.pdfIn PDF document text
    • http://sowadegepixu.22web.org/6627188796.pdfIn PDF document text
    • https://fekipasipoxow.weebly.com/uploads/1/3/1/6/131637207/leleleg.pdfIn PDF document text
    • http://dabuzasomadote.22web.org/duximotoxuda.pdfIn PDF document text
    • http://triple-doska1.club/xidonadokefisefemusakos5wlc.pdfIn PDF document text
    • https://gerogebu.weebly.com/uploads/1/3/1/6/131637886/3464258.pdfIn PDF document text
    • http://vamekujo.66ghz.com/american_english_file_2.pdfIn PDF document text
    • https://cdn.sqhk.co/gerezowuves/chcjuCx/remiperafoze.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/gcvni4A/22960283269.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e44bcd0f-0f7c-4c6e-b2ab-c36cac23ea71/storyboard_software_mac_free_download.pdfIn PDF document text
    • http://nepunefetonub.epizy.com/85708185129.pdfIn PDF document text
    • http://diwulabasiluxe.epizy.com/indian_instant_pot_cookbook_recipes.pdfIn PDF document text
    • http://merojupamen.epizy.com/what_was_the_third_estate_during_the_french_revolution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601fa0e0-564c-4220-a882-381b3f8f6934/wodudabubejobosopimag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 5324 bytes
SHA-256: 3a8c05596dc3a5ea34351a2bfbc18bd4d030444ad87bb8e2ff12b7a873ed9c28
font_01_sfnt_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 11264 bytes
SHA-256: 39d01f62cc7b4cdd5426c0626eb4a7dc61da34531e9be5d86cd3e8c63c866633
font_02_sfnt_off00012116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12116 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f