Malicious PDF — malware analysis report

Static analysis result for SHA-256 050aee460bd53f3c…

MALICIOUS

PDF

78.7 KB Created: 2021-09-11 23:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef802a5d46c5d87f4ed8c7ff12dc9a76 SHA-1: 5f0bb208d18bfcb49fbb11e9889f2576a64ab589 SHA-256: 050aee460bd53f3c89fab1a2d34afcbc5b7d7a6aa0d1c239411782e32a28d658
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous links, many pointing to disposable domains and identified as a link farm, suggests a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect the user to malicious content.

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 http://refah4ter.info/basefile/hotelrefah4terir/files/xuzepujukerev.pdf In PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/kopupazataxasu.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/gudelizavuzuxowojibalilov.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/mebepudolepuze.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/rulujipoxuz.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/9100382422.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/xefubufonirixevixosime.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161340d5446b52---muruzas.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/37328669674.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/20687366806.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/siwix.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/99454411993.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/gajuwemeziro.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210906231138_415752528.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/moteletuwabikamub.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/49020364703.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/25212042209.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/gawuzisepi.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/lui4473eh2cud6543oiflm8uk2/89945176027.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/roromi.pdfIn PDF document text
    • http://caythuocnam.org/images/files/92335565902.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/vudazigaminimepijaso.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/15758271955.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/gereze.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/nasaxuxegoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=iphone+12+pro+vs+samsung+galaxy+s20+ultraPDF link annotation
    • 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_off0000cb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5F 11236 bytes
SHA-256: 3a0c3b02f4a3de04e6a29af272a564453674b475801692228af5ad814f42b34b
font_01_sfnt_off0000e5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B3 18080 bytes
SHA-256: c2e2081f9333fd7c42b2e6b03f1895d80728372aa2dc5f17c3a8cec93403f97a
font_02_sfnt_off0001149a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1