Malicious PDF — malware analysis report

Static analysis result for SHA-256 96320fa35a644bc6…

MALICIOUS

PDF

89.8 KB Created: 2021-09-19 00:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2dbe46c3b752d445427441c8b4aea7b5 SHA-1: 45c8c9036b39b80dfccff8ca2887bf7bdf4d2d4b SHA-256: 96320fa35a644bc6ddfb9ab88f17dac6f8a2d69396009a96486d8b990cddce7b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm and potentially containing callback phishing lures. The embedded URLs suggest an attempt to redirect users to malicious content or download further payloads. The presence of PDF_URI and ML_NYX_PDF_MALICIOUS heuristics strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pistant.ru/uplcv?utm_term=engineering+economy+8th+edition+pdf PDF link annotation
    • http://zamgph.com/uploads/file/091015122858.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///xikuxikere.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/wapades.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/dovapuxukemudop.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/zebunuzapiwabaso.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/64566429727.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/62870518724.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/zowazor.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/tunemuziduwubapes.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/10373956110.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/31255410514.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/8683747393.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/24215733202.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/61285788238.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/fuwuzopesifanof.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/57051333421.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/52845168541.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141688eedc6f---juxosepeza.pdfIn PDF document text
    • http://atrsara.ir/resource/files/jizutorepenib.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/51579964685.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9cb9e452a---40407368397.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210905_C03C5B85648949D1.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/wufemunekisomuj.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/winizob.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/kidefamasagixiwu.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109150506171035.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/72103134723.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/58826623651.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_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4B 10996 bytes
SHA-256: 7788a7fa962653927ebe10e75c2c970c354630838320a58c971bd06e43d6c8c2
font_02_sfnt_off00012776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12776 18712 bytes
SHA-256: 6c0bc9964aed64d5299e1c12776aef389930c3a131f2a16009a6767301767ca8

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