Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb640ebcdc7395c2…

MALICIOUS

PDF

76.5 KB Created: 2021-04-03 21:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5331da6126bb419a1fd2728108d06386 SHA-1: 1e8172e6cbd0fc9a6568a0d95f350876ba540787 SHA-256: fb640ebcdc7395c25672cf983f6d6fa393ae244cde1d75a2e2ea1a4501b504bd
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the PDF structure point towards an attempt to disguise malicious content within a seemingly legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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.
  • 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/123?utm_term=miopia+hipermetropia+astigmatismo+presbiopia+pdf PDF link annotation
    • https://cdn.sqhk.co/dudurejavir/gbss6jh/netepemenaz.pdfIn PDF document text
    • https://cdn.sqhk.co/xusawikorut/Wjjgfjd/guguseparunewukozabanom.pdfIn PDF document text
    • https://cdn.sqhk.co/muruwake/igcvTih/47500160600.pdfIn PDF document text
    • http://fiwetud.scienceontheweb.net/anamnesis_fisioterapia.pdfIn PDF document text
    • https://ronurakegilapoz.weebly.com/uploads/1/3/4/8/134852428/655a79d4d1a69.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/foxomosazonoveg_rareju_bewonojif.pdfIn PDF document text
    • http://bepelisufozasep.mywebcommunity.org/aberrant_behavior_checklist_free.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/uhgkogf/5734874071.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/jehbZtY/global_pandemic_meaning_in_kannada.pdfIn PDF document text
    • http://wajazenizur.mywebcommunity.org/apis_dorsata.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/jaig1hi/twitter_video_downloader_app_chrome.pdfIn PDF document text
    • https://dutumeparozawa.weebly.com/uploads/1/3/1/1/131163590/9166837.pdfIn PDF document text
    • https://girewatadetax.weebly.com/uploads/1/3/2/6/132681062/givoxejaku.pdfIn PDF document text
    • https://cdn.sqhk.co/gagufatemo/A9ghEha/nuvitalejoronogum.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/IieQigA/97858657547.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/fegerip.pdfIn PDF document text
    • http://sinoxaju.mygamesonline.org/antihistaminicos_h1_y_h2.pdfIn PDF document text
    • https://xunatopek.weebly.com/uploads/1/3/2/7/132710497/8595492.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_2d13176ecc744496bc1209338272c9b6.pdf?index=trueIn PDF document text
    • http://lumosaneja.onlinewebshop.net/why_is_my_great_dane_so_aggressive.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_21b18ee70ba44cee97025983e43c62f4.pdf?index=trueIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_9882a5155d9846c9ad3ddaf3814acc94.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_8dd949c111a147d2b49cf57cbb29f767.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_off0000e8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EA 5568 bytes
SHA-256: e8ccc1e25dd6fd2b89b7213703a46b50a68ca45dbb223c1616b03f7bd5868a3e
font_01_sfnt_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 12812 bytes
SHA-256: eeb0425d8640dfcce65dd7f93634445b1588ca3b9a89023d75a667bc8ef2ed57