Malicious PDF — malware analysis report

Static analysis result for SHA-256 92eadeb9981845bc…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 17:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ddd8117ca8b6fc8cf9917e732a2d0296 SHA-1: 6d036fc63eb04464b6b88ce50a9384b6f6de5730 SHA-256: 92eadeb9981845bc35754d19449d8deca39947d0bf99ae9818d1bdf85af56b19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://smm-mm.com/uploads/news_file/51902828845.pdf In PDF document text
    • https://itchanoi.vn/uploads/news_file/pakamajiroxif.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9d3e5751---21224702007.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/wofubumabamojufigu.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/96349505085.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/97836091784.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/wotima.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/lipubisazuriledaj.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc6e01976---rikibugazinawikorisof.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/2151837983.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210901202945.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/7837426831.pdfIn PDF document text
    • http://poliinc.com/upload/files/81520565554.pdfIn PDF document text
    • http://ktcz.eu/files/files/62363736826.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/12294813902.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/gekupuk.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/wenokupofonewube.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/79034290436.pdfIn PDF document text
    • https://tarsiman.ee/files/file/83660540615.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/vinopalutes.pdfIn PDF document text
    • https://www.dtd.com.pk/ckfinder/userfiles/files/48277684568.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/mewuvesajo.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/wadusezagatoto.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/fajomom.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/jejepugoreliwalebaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+can+i+delete+apps+on+my+phonePDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/xobov.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_off0000b58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58F 15436 bytes
SHA-256: 3cfb4c089f4e904866b3a23d711c29eba5854471c8dc63881238060845b724aa
font_01_sfnt_off0000dcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 10872 bytes
SHA-256: 1d4581216e818f37fa258f235a2baadb7dc54864f9ef678facf69fb585198a51