Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bc222c08676efa…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 08:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0d361296e7ace8f44818181521e516f SHA-1: e09dc7783d99effa33753affd349305f85cd7d4a SHA-256: 25bc222c08676efa9ccbc099779f2773a12d2f3ceba33c765bfdbb1e06083096
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an embedded URI pointing to an IP address, which is a strong indicator of malicious intent. The PDF_IMAGE_LURE heuristic suggests it's designed to trick users into clicking on an action trigger, likely leading to the external URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://keemunblacktea.cn/uploads/file/210223125847.pdf In PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/tapaxujazadus.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/kusuminaror.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/binesutivujemozuwaz.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/93980978274.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/keletan.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/90918246646.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/4999589724.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/delodarazetir.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109180958455887.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/nemaxev.pdfPDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149db8757671---dezefodavud.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380ad850b51.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/vipijaforagige.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/xusonubuza.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/62711588550.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/xuniwegagomogajikokeluni.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/zabasa.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/58704569669.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/nifasojeburu.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/miwuruwukoluwajawezi.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/dutigo.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/85458124708.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/47340066667.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/kuferalonajok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=beach+buggy+mod+apkPDF 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_off0000b057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC869 14232 bytes
SHA-256: fa77a42f645c666ff73ba42bddd7db7cc2849a5ab2c5b0525a4aaf6fac241412
font_02_sfnt_off0000ec21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 10852 bytes
SHA-256: 1268144d4e7a4ccef9ac90362de5be1cdf57b9777102ded36244f04587fb4970

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