Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8e6b936ebcd03c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 21:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a5b3da8835491211dd990f2eafa3a0f7 SHA-1: 9d1f10d84acdbc522699eb1e46bd8620f44aaa70 SHA-256: 2f8e6b936ebcd03c717ab49fa88e63bad71530a5d6a27288a75109c5d4ec7c74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://coretry.ru/uplcv?utm_term=how+do+you+right+click+on+android+tablet PDF link annotation
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/paretavaxiwiguwezosaza.pdfIn PDF document text
    • http://dr-temt.ru/images/file/69448552427.pdfIn PDF document text
    • https://angkalaris.com/contents/files/xawomagezugoporunifuz.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/35686206140.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fde6e2c98---vojekelatedox.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/71384006270.pdfIn PDF document text
    • http://megalaserasia.com/upload///nujed.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/k099e1c6f1h107pupbqf2belu9/rosaluseja.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/delawetiluxewuzekawaj.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/pifufalixanemij.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/10698894333.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/45264697720.pdfIn PDF document text
    • https://orrizon.ru/images/file/86495590444.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/fasuborasa.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/61880235412.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/tawesob.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/bujiremi.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/59367096344.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/rabaradopu.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/67142380820.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109050105511377.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/dupoboripadak.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/kivazorafoj.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/70270283364.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/77774531951.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/tuvojoloperusape.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_off0000db12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB12 17880 bytes
SHA-256: 7a951fc1f1ee896babec8a1fa05d7bd8356b8e81da0bdcf1903276a1b3ade486
font_01_sfnt_off000108b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B5 11004 bytes
SHA-256: 21a15fed7bead07ae681dab00b798e51ea70887ce819a5e9d0b43199ae5e011b
font_02_sfnt_off00012207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1