Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40cb2846a1cc423…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 16:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4ef2f4877e7cd1b31ae1012f90f2f20f SHA-1: ced0d149433e564efc75e1236d25a0b2dedfac3a SHA-256: d40cb2846a1cc423b518d72feb88bdabd51fadb69a9458c502b327a2374c1bd4
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the structure and numerous URLs suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 4

  • 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://queure.ru/uplcv?utm_term=seroquel+prospecto+pdf PDF link annotation
    • http://halaljones.com/uploads/files/15203521872.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/62208660652.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/39846709931.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/nepuxobijosifurabetajen.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/65389583588.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/rasokafix.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/puxitovemunep.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/zemodiwagamiweleliw.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/pozegadalozivakewofu.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/savinesisajitujaxojuw.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/zopomefesomu.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/vinuwexisavitokijadesu.pdfIn PDF document text
    • http://www.polni.si/Images/files/29092163510.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/loxomasamim.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/vomofe.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/mojixawenodap.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/74814871324.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/gavob.pdfIn PDF document text
    • http://cochemical.com/upload/files/romekurixox.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306fb2dc26c---sorebuwom.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/21926557532.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/lilibumekirogosiburoxibat.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/kutetopalu.pdfIn PDF document text
    • http://ijfbn.com/editor_up/korika.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_off0000d484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD484 10576 bytes
SHA-256: 5f9d0068d8d55290e4ee87b3953b21394b5084cf0b549a6e0af39ab5dae93076
font_01_sfnt_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A6 18448 bytes
SHA-256: 5cdab69eff661e24c501d1547a48b773aba1ba185f6dfa5e3da817b7566a8c33

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