Malicious PDF — malware analysis report

Static analysis result for SHA-256 e337dbec3c7269bc…

MALICIOUS

PDF

80.6 KB Created: 2021-09-20 16:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ffc71f463e7cbf68e3cd0f75b7a56641 SHA-1: 76d73063256999906de5c5b5b743351748f22522 SHA-256: e337dbec3c7269bce6ad2beb3dd708534f8f44ee3c00b3bf6bb1e6ba8fdd3639
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which point to disposable domains and are identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://garglob.ru/uplcv?utm_term=mobile+internal+storage PDF link annotation
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142afe77ed88---girufuji.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/tajov.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/12239305425.pdfIn PDF document text
    • http://whatdwellswithin.com/file/68701608004.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/49663501346.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/84845193801.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/vexogaxokixez.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/83968899625.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/zurabugugewuxupodeka.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/51536010348.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/11413590530.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/12358230737.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/bekileni.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/miwixarowojimodetuxoxab.pdfIn PDF document text
    • https://okazionche.com/files/bujaroxonopuni.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/gusikamobupavam.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/gojawamulegaremejo.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/88087049827.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/57367745398.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/sipajatedu.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/vuzupofig.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/14849676336.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kimegivexivurotazosegad.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/37962954663.pdfIn PDF document text
    • http://houselandia.ru/files/sujumatanotirufinorode.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/tarafolo.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_off0000d69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 17976 bytes
SHA-256: 8770d1e4666bece7175e3e4be48d3840f1a1dcffe6057f7e86b0f4b348725d08
font_02_sfnt_off00011d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 10416 bytes
SHA-256: 22135c073eecd9273402dca779ed5d010232e16a790dc9226aa32a763fdc3b3c