Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5b1bbbb080f7c4…

MALICIOUS

PDF

96.5 KB Created: 2021-09-19 01:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bce5f5dbcca2e025c573afa129d46a3b SHA-1: f03133744432315c997fb392764c333716b1155f SHA-256: 3b5b1bbbb080f7c41c05523c697031cfdda0984965b96801114e38eb6ed4cccb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs pointing to external domains, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content indicate it's designed to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://catamma.ru/uplcv?utm_term=descargar+juegos+para+celulares+android PDF link annotation
    • http://obraz-tlt.ru/userfiles/file/gufojajilabisakomolu.pdfIn PDF document text
    • http://abnicum.com/files/file/gifelizadoxivoxebi.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/wanimujolex.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210918_EB0360CF716F4C46.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/69425084901.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/jopir.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/bedaju.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161443a41ca49d---faxazepexidix.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/jodazomo.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/jofuvivafagu.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/24707209261.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/47390197950.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9055ac03---tilukumixozeroxoribezori.pdfIn PDF document text
    • http://hodori247.com/uploads/files/vilaxagibisozifubiviputa.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/wusekivujefasi.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/1836609932.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/tivusavuteniti.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/67949299126.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/kurokonomabenajosam.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/xopij.pdfIn PDF document text
    • http://youil.org/userData/board/file/51024330040.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/ginepozebez.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/xawotabomare.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/268823008.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/poxolubuvog.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_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001286d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 10820 bytes
SHA-256: e867fa1af03eb050b328527c6e3c1b675ab48d9ef7bf892a01e1708712e89c9d
font_02_sfnt_off0001413e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413E 19920 bytes
SHA-256: 5cb480efd6a58b14914ab767436f50256d4f133a32eb2982a4c4fcf7ff066182

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