Malicious PDF — malware analysis report

Static analysis result for SHA-256 9644eb80c778d731…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 02:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9abfdb758e5330001fd8ac4fda544f62 SHA-1: 41150330139ab3522d330e9cf45254e0f94fa76d SHA-256: 9644eb80c778d7311eba2a0c4d1c2be411453bc16e65d4dec4f283e42df78f5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 5

  • 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.
  • 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://garglob.ru/uplcv?utm_term=best+auto+call+recorder+for+android+mobile PDF link annotation
    • http://sieuthicayxanh.vn/webroot/img/files/detud.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/mixuvuredemarutinozadofo.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/bosilukevipoluza.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/43e7aqnbeiufhcbe4tsv8na9ul/31781353817.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/bututujuxakunafupojalaku.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/99567060210.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/xatufukidama.pdfIn PDF document text
    • http://dytac.hk/userfiles/pupesakifaberid.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/65620026917.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/wasewizupesavebuwukabojez.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd09474e0a---guxopatexazekonovigajuvos.pdfIn PDF document text
    • https://aokman-drive.com/d/files/vufebonofadem.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613956dc0edff---vitakefux.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/66095744265.pdfIn PDF document text
    • https://viceda.com/userfiles/file/40856437874.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/56414757004.pdfIn PDF document text
    • https://training-access.com/upload/file/65376635401.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/91001262601.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/65998890239.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/zowumasin.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/direvidoxupiwakojefeg.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-12/images/files/23201532565.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/45548333259.pdfIn PDF document text
    • http://gaineyranchaz.com/userimages/nipej.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/mulurazenexaworiv.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/nixisapikexegovoxu.pdfIn PDF document text
    • https://semut73.com/contents/files/90757197156.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_off0000b4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF5 10932 bytes
SHA-256: f2bff66c7a386e369dc3cfad153fb62caced0d48d83ab42ef110b1788074efe6
font_02_sfnt_off0000e64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64D 16420 bytes
SHA-256: 55e989288fd06d27bb4056cd25027f984b68b60f9d9e1b24a7fb40789e492fc9