Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7b461d67e6ba32…

MALICIOUS

PDF

75.1 KB Created: 2021-09-21 20:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 97fadec830ab0862f3e23c135cb31a94 SHA-1: 53209a1d295a8cfed0876f00008034d289090fe8 SHA-256: ae7b461d67e6ba32f84ecd2597ff9692dda263f2300a15b6d9babecdd1fadd84
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 heuristics indicate it functions as a link farm, directing users to various PDF files hosted on disposable domains, one of which is associated with a 'quik video editor apk' lure. Although no scripts were directly extracted, the nature of the link farm and the ML detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dataction.org/demo/dataction/media/tagozexobabiromarizepo.pdf In PDF document text
    • http://bonekarusa.com/contents/files/nagagefeli.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/86217012123.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6133216c4f266.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8bfa3f2a4---45542147758.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109092045136386.pdfIn PDF document text
    • http://signauction.net/userfiles/file/jefekibo.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210904_2D5F0FF714BB54AD.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/b967decd59786b22d6be82b87c92a49f/21289051144.pdfIn PDF document text
    • http://aquatherm-graz.at/files/xujewozajuxasi.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/zejalulogofiw.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210905235138.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/71909671428.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/bizifevurekox.pdfIn PDF document text
    • http://hbaoge.com/upload/files/sazoretipuxalavimunito.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/tirifetekopovaforaxevun.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91149715279.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/rixemixoko.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/zarokepuniv.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/tolupijizawitamaga.pdfIn PDF document text
    • http://offerparts.com/upload/files/vapiwadipa.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/xanisolixuwovatubotit.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/muzadosegaxopinuz.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/41402972583.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/vuzimekow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=quik+video+editor+apkPDF 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_off0000c10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10B 17888 bytes
SHA-256: de793684ff52956876d0ac907b49f12496bdc06ae085b770e1f187c2d559cb5a
font_01_sfnt_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BF 10384 bytes
SHA-256: 770e1cef371c880cb185fc41d6342d8667530cb249f72eb98b17d87a5f14bc54