Malicious PDF — malware analysis report

Static analysis result for SHA-256 e561843e0e51e4aa…

MALICIOUS

PDF

72.5 KB Created: 2021-09-14 04:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6870a85e800d1306416091ace4e7211d SHA-1: d4c0da341180ebf6b4c9d3a2b50b6d6d5f32b125 SHA-256: e561843e0e51e4aa8bd034d13fd10283be701a65ae1c0b0e0a5fee3ddb4b9621
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs that point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. The presence of these malicious links suggests the document's primary purpose is to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=multinet+led+40+inch+price+in+pakistan PDF link annotation
    • http://elitacasa.it/images/file/75620152903.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/jogufakedu.pdfIn PDF document text
    • http://vecsecity.info/editor_up/77520104643.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/vijafaseduzu.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/rasixanopepuzipaxekedum.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/wosagapuwomijobu.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/nedajeziv.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210912173831.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/wozisim.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/majunofefawudabenulapupi.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/refolijipi.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/25573440222.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/pibalaxomopefek.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/23278155416.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/biwiwulepisomuk.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/67111341003.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210902213120.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/24816169464.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/9343068151.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/10754691844.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/lirebisatumovadafag.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/21974142194.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/97746687203.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/56910022975.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_off0000b6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE3 16724 bytes
SHA-256: 8a0ddfffb33c33943b30cd0ee70b084241ee5ae4ebd3a6de67361dbf09c3a46c
font_02_sfnt_off0000f9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B8 10876 bytes
SHA-256: 673d36c51231f719d12fe9969ee90960eead78691a074000dc116ce3545712d5

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