Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d0a356fa4e314a1…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 19:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53441ffa8855729871becea3c6d1ab87 SHA-1: dbf334f99ca9afd13f4821346d500c63646e3502 SHA-256: 0d0a356fa4e314a1efb4418461570b0863ec03d4b75dc0024dc7d6590027ff41
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to obfuscate the malicious links or to initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=phone+keeps+turning+on+wifi PDF link annotation
    • http://f1-rennsimulatoren.de/userfiles/file/wururuwezokesuzifi.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/689049610.pdfIn PDF document text
    • http://apsons.eu/files/file/61551753045.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/12116703114.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/perujunowoborunuvatito.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/98296287158.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/80751184268.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/37428784069.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161326d195e177---49695095571.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/83600733843.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109031401553225.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///46651940388.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/13220511611.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/lozofewetawaki.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/60411966994.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/75288113377.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137baef05d6f---74472364641.pdfIn PDF document text
    • https://cubic.is/userfiles/file/59450549986.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/vibatajotebizipireka.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/buripajozaguzov.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/giterizugarozopirepid.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/82063329972.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090205124898740.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/gevibeguzemuwarafi.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_off0000b359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB359 10708 bytes
SHA-256: 6398ef747362adfc4ec3a73215fba25d18f786dbfc679568c3817e19437160f7
font_01_sfnt_off0000cbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF4 16304 bytes
SHA-256: d3260d5fc42f29ebdb0d702fabb0fd6a768f71ae3fa00ca40ed626e10ead9452
font_02_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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