Malicious PDF — malware analysis report

Static analysis result for SHA-256 699dc8d066fe0cf8…

MALICIOUS

PDF

69.5 KB Created: 2021-10-03 21:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6de9ff2561987ea5f76a51e9a8b88b44 SHA-1: 0b4a9650760205cfe4a89dc93f1df649627f8f8f SHA-256: 699dc8d066fe0cf8afc17a3cfb9073a446b502f60cb95ccf9cac64e4805397ce
146 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of numerous embedded URLs suggests an attempt to redirect the user to malicious content. The 'SE_CALLBACK_LURE' heuristic further suggests a phishing or scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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.
  • 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://suprizpin.com/calisma2/files/uploads/14062394396.pdf In PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/90566299748.pdfIn PDF document text
    • https://irrisyst.eu/files/file/figifojafewenipitolora.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/24234740826.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/gewipovumenepevumegunifuk.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/hcp9eds5m18tgit0c62mpehpb3/42664466331.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/lazedilatu.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/90258139830.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/jarotegapeb.pdfIn PDF document text
    • https://ever-progress.com/upload/files/99996123397.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/20882109573.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/20135777349.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/zanivafomumelafetifaf.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mutewarokebafow.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/mibogefitinika.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/57457590765.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/20187233173.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/22789166240.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/wupesuvevexevemalu.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/meziji.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210910014734.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615681dad9364---miwufifemuvesodir.pdfIn PDF document text
    • http://chapelguild.com/images/usr/82021277292.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/98352968527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=lay+down+mazairePDF 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_off0000af81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF81 10316 bytes
SHA-256: 75ae881825670c7298b251e6d70104627cf0b9c391a0573c51b9bf4412fca199
font_01_sfnt_off0000c6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 15916 bytes
SHA-256: c11f245187986d3ca598fbd788718e8df4e2d9288f33d7c70b5e0c260e4ed176