Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af950943008f8fb…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 17:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1b379c6a9e5e1727603d67ab38c46b6 SHA-1: 6ca4d80fdd03bb9c9710e0a9f21423f8278a5768 SHA-256: 7af950943008f8fba8da5dc99ef0f201c8ae234a4a1439ee8e29fd42636fbbc9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure itself can embed malicious JavaScript, which is often used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kurskodkb.ru/page_edit/_samples/userfiles/files/65514361761.pdf In PDF document text
    • https://agrimal.pl/userfiles/file/50551272139.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/10880772039.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/82743662575.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/8646560503.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/wesazatozalerolote.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/2747393331.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/70290572614.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/70917005325.pdfIn PDF document text
    • https://patc.fr/imagesfile/13001561355.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/28578830153.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/nuvapimovurexaxukegita.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/zabitofiforijugopakifa.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/5546388651.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/57426287813.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/41594150021.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/8gesdg4aa9aqo7q4p6h3jal696/tafalir.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/28232317331.pdfIn PDF document text
    • http://exosushi.com/uploads/files/33696803438.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/20451795530.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/putibomiletowavilobajenir.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16144edb4d4fa3---lowanofuxidulazawitan.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/28106070227.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/27143894598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+market+share+in+indiaPDF 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_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 10540 bytes
SHA-256: edd0e0eb5ae2100e0bf815025c47a160448034cec4f25c967f8b69fe1edb8ac4
font_01_sfnt_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 18028 bytes
SHA-256: d2eea5f48f595304ead171071eba67ba738423e3d3372cb90cadbff6b32e2ac6
font_02_sfnt_off00011fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1