Malicious PDF — malware analysis report

Static analysis result for SHA-256 da930da89ba8c9cd…

MALICIOUS

PDF

67.6 KB Created: 2021-10-01 10:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3920cada1fcc70aa397679dd187cf58e SHA-1: 92db7afa2df849f529e4609ecbf54230993dc52a SHA-256: da930da89ba8c9cde6b51129b879546eb182f234320512a20b381db4a19f37bb
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link, a common tactic to redirect users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and contains no readable text, but the presence of numerous external URIs, including one pointing to 'smidgel.ru', suggests the primary goal is to lead the user to a potentially harmful external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://smidgel.ru/uplcv?utm_term=where+to+find+deleted+video+on+android PDF link annotation
    • http://worldplastsolution.com/ckfinder/userfiles/files/zubavurikaruf.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/lananosomutup.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/gawun.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/zamenazigefedidolorobos.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/dizeximeluxowafezezugatus.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615451598d9ca---90309592774.pdfIn PDF document text
    • http://szm.hu/userfiles/file/12119507248.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/8049469143.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/vitijaworivebanijojibik.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/kunutatetedovozoralukij.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/94339503512.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210912044634.pdfIn PDF document text
    • https://serka.com/serka/upload/files/jizoxumanifuj.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/wavoxip.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/nadujopebevaj.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/rapipewapofor.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/5177032194.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/3774079229.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/tezoreg.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/77059104577.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/52480096581.pdfIn PDF document text
    • https://premiersuli.hu/files/files/72085264644.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/70889134109.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/lusakezadopejagitave.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://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_off0000ad54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD54 10340 bytes
SHA-256: c35254c5a370d5bfd004e745aa501f4d63a5672d6c6c494b5899a5d537951c26
font_01_sfnt_off0000c49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49E 13824 bytes
SHA-256: 753e664c9b84ca28824c5994b5b5c6a387ecffba74fc09f2663d5676463c7d39
font_02_sfnt_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1