Malicious PDF — malware analysis report

Static analysis result for SHA-256 b143ad36c5dca421…

MALICIOUS

PDF

75.6 KB Created: 2021-09-28 20:57:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 74f8ef5d475b94cedbd41e9c2cd5c8ba SHA-1: e282a1fee983d0af8d707334533c1b19397b13ef SHA-256: b143ad36c5dca421bbf43bcaf4948d17eee383daebd8a50b3c25114bef02de98
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ML and ClamAV as malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the overall structure and heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://inwama4.vn/webroot/img/files/damutaditazewijuxebiwa.pdf In PDF document text
    • https://s-serviss.lv/userfiles/file/65400687952.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/75489814089.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/30075217308.pdfIn PDF document text
    • http://asja.ua/userfiles/file/nitiworiroxalatipipilob.pdfIn PDF document text
    • http://dd-eng.com/files/files/fexebuxelefaginelolijuke.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/51860069250.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/nuwexuvivinonuwavumubel.pdfIn PDF document text
    • http://kes.org/upload/editor/files/33702240611.pdfIn PDF document text
    • http://cecev.com/stockages/files/rokud.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/74605957317.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/10580746825.pdfIn PDF document text
    • http://3q1p.com/upload/file/210918111719294627bag6v8swh651.pdfIn PDF document text
    • http://home-plast.ru/foto/files/togifexemavibefikudikupas.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/fosamodagomubudabunet.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/735958972.pdfIn PDF document text
    • http://taxfreepoint.com/file/nexevisamurilutaja.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/rafefazisumolalibisofimuz.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/nibomefolazisuxojejo.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/kutisasazub.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614463ddaaed0---8615295346.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/gaxesubosarofidilonijad.pdfIn PDF document text
    • http://zerosquareonline.com/file/60498984524.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/surozegudoki.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147a66a07bde---foguxokosopugirozusesur.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/3817188289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=god+of+war+3+rom+downloadPDF link annotation
    • 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_off0000ba29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA29 10320 bytes
SHA-256: 9ea4a265e844f85ed31f8e101746c99b4f2aaa7b24c855972288486b50f868ff
font_01_sfnt_off0000d180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 21392 bytes
SHA-256: a9f7f0374a64bf5331c6ba8e652824d5c23ff47998f4dd4b82fb946524d070d1