Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc32044f9855e7d1…

MALICIOUS

PDF

75.9 KB Created: 2021-09-17 01:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a9cba51a6713d409b31493a1e281652 SHA-1: bcc24a83d4afe61124a65378cef85fdd0f0d988d SHA-256: dc32044f9855e7d188316f5ac1f14c9e251ed24a888633e5e218d94a94a4fb4a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ML classifier and ClamAV, with heuristics indicating it is a callback phishing lure. Although no document body text was readable, the presence of numerous embedded URLs, many pointing to PDF files on potentially disposable hosting, suggests a phishing or scam attempt. The PDF structure itself is indicative of a malicious document, likely designed to trick users into initiating contact via phone.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://st-johnson.com/Uploadfiles/files/83016427713.pdf In PDF document text
    • http://imobiliariaimperio.com/files/files/65620759314.pdfIn PDF document text
    • https://topupdana.com/contents/files/poxuxikekamefurepeteburam.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/pigesivirikejin.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/waxugavi.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/gefedevegodoriw.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/wopivagimokabapisuri.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210901191241_zw0ba6.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/12482231431.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/55569860950.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/roxosemiladukuduwu.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/mikave.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/muvog.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/32171153607.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/59556567448.pdfIn PDF document text
    • https://ccskin.com/geektic/files/87267140166.pdfIn PDF document text
    • http://stattus.com/assets/file/rafimibewiwowosipita.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/44239436233.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lujusirisajedomigexafuna.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/giroxopomeguzokun.pdfIn PDF document text
    • http://c-six.it/userfiles/files/13479211402.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/55804993213.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/jugasesigowemifed.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/fijotinal.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/72400205562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=dinosaur+king+games+download+for+androidPDF 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_off0000c23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC23C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 10880 bytes
SHA-256: 2b2258635ebb97d669c220ad973df337de8ae09bef592da658ec9f99fcd84092
font_02_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 17692 bytes
SHA-256: 255c14de9bc26bc291ef9d200ec758500e191a51e99306e70705afe1a4cefe84