Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb97a54ab2b03b2a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-22 16:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9c9fae70c89069fc2c4fcd8a430f13e3 SHA-1: 2e63ba6116a96061dd8cb2cd99407e1523263c17 SHA-256: bb97a54ab2b03b2acdd3ab77721ae84659f8f0456757d1195ede33a3d3ea5e0a
142 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, many pointing to other PDF files, suggests a phishing or scam campaign designed to trick users into downloading further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=share+vpn+hotspot+android PDF link annotation
    • https://ngoctraithaibinhduong.com/uploads/news_file/tosexapagivivetemokati.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/71154080854.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/lufabazixipigosesojok.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/46990500661.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/79833923884.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/76707303779.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/1995592395.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/60926403938.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/xafadi.pdfIn PDF document text
    • https://srinivasagroup.com/ci/userfiles/files/ganal.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109050019005443.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/lolomelenowa.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/75191086428.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/39255476416.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/kowetipojunefinolu.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/zeragakupudowizi.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134106097317---72283972142.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614352f507b79---435718793.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/74003391287.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/28057883037.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/tokiteremewupavajuragiz.pdfIn PDF document text
    • https://huanghecables.com/d/files/timifevubejajojo.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/88197337620.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_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 17976 bytes
SHA-256: 7a4437baa1223a8993ee277e0f8605ef1bcf1a571bcb03517ab3eced7c1b01df
font_01_sfnt_off00011223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 10584 bytes
SHA-256: e873d45832e7d88409ede6378fa67c74573db031fb1f76ec77f92f7e9a021427
font_02_sfnt_off00012a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1