Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c32a15c538b58b…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 01:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18c0c03ac67b67d107026a967b8839b6 SHA-1: 25af8103eb2246d6707691f6dd109ceeab8f311e SHA-256: 13c32a15c538b58b32c45cfd3c818092df680c130fa06ea8d79065f26a387205
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification confirm its malicious nature, likely exploiting a vulnerability to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=a+manufacturing+business+pursuing+cost+leadership+will+likely PDF link annotation
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6963d04d7---degawotefukupiwulubudoruf.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/wujafadubuxak.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/20029772365.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/boxumovibutewigesux.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/pisufawitiret.pdfIn PDF document text
    • https://istanajp.net/contents/files/moxofiwupizarotaboge.pdfIn PDF document text
    • http://banquat.com/userfiles/files/18178039682.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/22325126328.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/fivod.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/24972810159.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/taxamos.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/17050292128.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/22222427029.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/6238489888.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/godelosojupokuneg.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/rujogesizajuzafiv.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8bf00426---nulugag.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sadoresazukewepuno.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/xibudi.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/24064751486.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/remawovuxulu.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_off0000c07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07B 11580 bytes
SHA-256: b2191d65f36b4fc42c2dd1a75586f68c443964a674364b56a306323fd752314d
font_01_sfnt_off0000db70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB70 15600 bytes
SHA-256: 701f0e788ae0d41930d0b8262d40c609ab2ee3810c906e7318a810ea0a76ed77
font_02_sfnt_off000102ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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