Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ebb137532c0bd2…

MALICIOUS

PDF

71.5 KB Created: 2021-09-24 09:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa522379e6a89973ddb8357e4531defd SHA-1: 2a151cd0168cf4c1f9655323b2590a95b3c1e823 SHA-256: 34ebb137532c0bd27c3b9fa32fff36139cbc45615c5313c9d32866006d95677c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=kotlin+visibility+gone PDF link annotation
    • http://heryeryesil.com/resimlerfiles/8657716053.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/42618698292.pdfIn PDF document text
    • http://ktcz.eu/files/files/23343191539.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/wovajisudinofotuluxusel.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/77166057218.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/jiliwubetobiwewibasujepi.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/27237051328.pdfIn PDF document text
    • http://www.andreapondika.cz/file/dogogirisigepefomobagag.pdfIn PDF document text
    • https://medtek.vn/storage/file/8198659766.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/23494982072.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/jowiragepijud.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/daliwovefalezaja.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/kikeluzajisafuxiraz.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/53225279593.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/degebejixukum.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/12534504243.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/vamoluj.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/82986641929.pdfIn PDF document text
    • http://simoncaulkin.com/images/54125002722.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/linisalokudekojirun.pdfIn PDF document text
    • http://centronegozi.com/public/gumazajerazoge.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7019aa3e2---26548047577.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/mojejuwiroxokorime.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_off0000b0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D9 18796 bytes
SHA-256: e4b71279dae4ccb3bde2664f1e88085355d93b87abc23614f5b38a06ef806eba
font_01_sfnt_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 10332 bytes
SHA-256: 9af44bdbb09242e187b253cb91144762f6eb4f4fefaf97fbfff509dce792010e
font_02_sfnt_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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