Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5e1a82dc817fb6…

MALICIOUS

PDF

73.6 KB Created: 2021-09-09 03:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2600426f6de729f29a920ac58cecd8e0 SHA-1: 10dd5ec11c78f5c9dea28c0e37c73b7179e05177 SHA-256: 2d5e1a82dc817fb661672737101eae2b1b9d4884198d6c7308e750d6d6a20d85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis indicates the document functions as a link farm, directing users to numerous external PDF files hosted on various domains, many of which are disposable. While no scripts were directly extracted, the nature of the link farm suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smolninskayahotel.com/userfiles/file/rizezo.pdf In PDF document text
    • http://ropesadventure.com/d/files/gopibekanerelikovovure.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/jariwuxesedupeked.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/vawinotewuxo.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/80226608739.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/32829045453.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/rerilefilenapiwidogoxose.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/numer.pdfIn PDF document text
    • http://partnercable.hu/files/12518396397.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/memulukukesirusajade.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210903095527.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/79720060637.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/12787443312.pdfIn PDF document text
    • http://ssp.by/var/upload/58738766073.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/wupenadulonafesamu.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/vosililitepaxalif.pdfIn PDF document text
    • https://isuzuphonoi.com/data/dulieu/files/81130507292.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/bedugilox.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/zonuzefotitireso.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/72055452844.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/73855102315.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/nebimekewas.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/30641211335.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/49008116653.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/sojudemugafarez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=download+tomb+raider+underworld+for+androidPDF 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_off0000b6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B9 18560 bytes
SHA-256: 24e40251254be4279515338d50deb69bc850b2bc2a0a417663479552a6ea15f5
font_01_sfnt_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 10672 bytes
SHA-256: 25b3b3287fe033c71824442c968aadf943f46cf32a1d48c8db38c4d9e5c23955
font_02_sfnt_off0001006c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1