Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55b14f0c5ec04d8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 23:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b51092ecfef3ca5f6e8ce93d6339e5d4 SHA-1: cb35beee7405f1edb9baa83e9a0b7cc27f19e971 SHA-256: e55b14f0c5ec04d84a12e0a589d69fd9c5d98661225858a9f9a44e7b67dc7746
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and numerous external links are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cementfeet.com/userfiles/file/dojopugaranowasugoj.pdf In PDF document text
    • http://multiflex.ru/userfiles/file/72599230887.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/bijanasu.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/dewupodokiw.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/3abb93dd59abad4659ead0c1336013e6/80138176564.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/29675257805.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/86921363485.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/viwegimowafixitekapegege.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/11410993777.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/durisegafelaxokorukozerig.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/porenipi.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/ruzolerogizotubajoj.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/15425541413.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/nafewegerivad.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/fepupetopimadiv.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/5020780919.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/fazuvaweretupo.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/vaxisuviwizisek.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/xemekoxekitinajobivemij.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/87727613083.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210904_9820E3187FC49886.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/96313080653.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/51353377278.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/rusafobigelujixeraxi.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/fenowalokepavexutotezigub.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210905_130757.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/78478218800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+i+connect+my+android+to+my+carPDF 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_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 10508 bytes
SHA-256: 367dd35daea35cda6b44f5af8aa2a86772c083da0f398ff060e9bcf0e7671048
font_01_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 17920 bytes
SHA-256: 417e1e4ec30f308fd4d5d13ef75a1b9a48d2bbf24944416c4bc5c4709902a039
font_02_sfnt_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1