Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a946585447f30f5…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 17:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a81cebf34817e8da77d75c289c3be9da SHA-1: 932a3f631bfcfe15f660521961ec0d4229e57136 SHA-256: 4a946585447f30f5e6ef35fb9d97a848b8b044a34341e58e9f2abad1bf88a6b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=avengers+infinity+war+streaming+free PDF link annotation
    • http://oskarmak.com/userfiles/file/43736696638.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/45128042870.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/mefedebagogag.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/riparuzekolupidojogoz.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210914004527.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/kebilogixofeximu.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/xisotodonaseturikizajo.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/3658795995.pdfIn PDF document text
    • https://vpmemorial.net/images/file/35148643092.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/98607857799.pdfIn PDF document text
    • http://kahasat.cz/data/file/jinerabegatijaz.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/karazefikovup.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8c2e55f9---17439709148.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/xujutupa.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/liwabewirujas.pdfIn PDF document text
    • http://dongphat.net/upload/files/51810135981.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/rofupumerunexuxolejopa.pdfIn PDF document text
    • https://iwistw.com/upload/files/52269296221.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/73817292886.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/62338719484.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/aae989e5f7506cd9f09fd117835e514d/jaguzixadubafumi.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/nesebepefagujapunomepu.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/lovefafob.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/70501480393.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/36100994711.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_off0000b2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A1 10640 bytes
SHA-256: 1d1d9ee4a371cb3b7bd54da5abb53006eacdffdb367dce511662bc8a2694f68c
font_01_sfnt_off0000cb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB15 16284 bytes
SHA-256: 0f4b9e20b4b924b1a37e8ee62366ee92aa312f987545fb1cc0b81b77acfdaf5e
font_02_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1