Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc6ae4b6f7631a72…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 18:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4a6a9e4dadb1f7361249c2d3cd390be6 SHA-1: 2deb2907502f36a35430b65ec57430933ed48b90 SHA-256: bc6ae4b6f7631a72f5cf979b21d1525bfaf784f4798ccd46eaf23b104ad79278
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to disposable domains or link farms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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 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://infrive.ru/uplcv?utm_term=iphone+11+pro+max+vs+note+20+ultra PDF link annotation
    • http://lumieye.com/userData/ebizro_board/file/68277402664.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/83222472378.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/jaguso.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/5224247526.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/21599666474.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/35765872307.pdfIn PDF document text
    • http://ilkemymm.com/image/files/52534197764.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/b2ae109a31a8eda0e72261b38eabeff4/fozakoxilukusowakoxexu.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/pixodaboduwokumenarawur.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/fufopumagekofakuz.pdfIn PDF document text
    • http://saint-party.com/media/file/biviwiziw.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/pakanijatupinagifubo.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/17634900587.pdfIn PDF document text
    • https://makenie.com/upload/files/81368364578.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/177b697bceeb1cf02abedb0cb6f31b28/wijeke.pdfIn PDF document text
    • https://fototipia.hu/files/files/56364618323.pdfIn PDF document text
    • http://allasclub.com/campannas/file/malenasupamilozevukubi.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/58878394610.pdfIn PDF document text
    • https://estoniapools.com/contents/files/basadolafudafi.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/ditiremifafopixakus.pdfIn PDF document text
    • http://gtshotel.it/images/file/dalilezigidixojawusug.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/wodoxilabawekul.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/kajazegijixadofigip.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/sadaxokirijabunetarufu.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_off0000d177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 10940 bytes
SHA-256: 562b396ad4b74065886b5c582b19d07f363a3cd1048454153d01a09d67f819d6
font_02_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 18468 bytes
SHA-256: 5fb5aa84f9e26037b70109568043d5034ccb7359965cea1d86115cf6e98f5aea