Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc65c1b76cc10f5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 02:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a3112528fb3f4a93b613ce5b2f2f576 SHA-1: 6655b2670c4c3a4d2b9ee2e0c427573ec9a06952 SHA-256: 1dc65c1b76cc10f57ff43d756ebe3599e868811363293cd68321d5a78daff5a7
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains heuristics indicating it's a link farm and a lure for payment redirection or bank detail changes, often used in business email compromise attacks. The document also suggests a password-protected archive handoff, a common tactic to bypass gateway scanning. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://huntic.ru/uplcv?utm_term=how+to+erase+all+phone+data PDF link annotation
    • http://mijinmotor.com/fckeditor/userfiles/file/16725848300.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/609626544.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/jezavak.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/bafe9ef21ae845c3d71b300db6f85f34/sufun.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/kozopexixupemiturofupexi.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/tudunogun.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mifuvodapeke.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/nelalatalikid.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/vovigebevumufibajijev.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/wejatudosisowedat.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16137ee0175db9---nebiwetizaluvesiliwegone.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/labitomevin.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/73889900154.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/namesegu.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/14332058231.pdfIn PDF document text
    • http://hkalc.com/userfiles/43287852439.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/19943171450.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/voweporagug.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/30740634931.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/55382315595.pdfIn PDF document text
    • http://uteambio.com/upload/files/wirodisaliwumidubaxivare.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/dudidagedagovavafitonuv.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/xuruzomob.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/jafamaregogugakexesaxik.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_off0000d6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC0 10472 bytes
SHA-256: 2e68ad431a8069692df0318d68ca86ddec557243e69ec86399ea08c0516e7342
font_02_sfnt_off00010687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 17704 bytes
SHA-256: dd79234adec330fdb90ab219e05beeede7ec8267f3a6926934fad434ddd3e1e6