Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cc12cae1b9230d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 11:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7339850222aabbab84eb3e6984b94443 SHA-1: 6706d2902fefe60a0867ce73f9618d7f90944d7c SHA-256: d5cc12cae1b9230d247b5700f7862ec28d1ce5986e233eae3a584a3772bc92c8
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 phishing or malware distribution attempt. It contains numerous embedded URLs, many of which point to PDF files hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The presence of external URIs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/luwologemujotaneke.pdf In PDF document text
    • http://elementyzlaczne.pl/media/file/16188983271.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vunajifudaxi.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/fesedefaz.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/ganufabimitesubidiz.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/21339263715.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/2394612141.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/64904415665.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/35943451238.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/pepebifap.pdfIn PDF document text
    • https://idosekotthonaveresegyhaz.hu/files/files/ridajuginasu.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/bajumuzorugade.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/64446497060.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/fagera.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/46983609316.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e175586d0b---8862739308.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/vajukofukavuxesiw.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/90067746417.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/53885278845.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/monuj.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/gaxuvubukawezoxisopur.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/zaxuvarupegekopalexekiva.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/99711951298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=fortnite+all+ps+plus+skinsPDF 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_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 10412 bytes
SHA-256: 316d79254583c5781aa28569727c70420abce393468b53143ca2057ff15c0ee9
font_01_sfnt_off0000eff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 18208 bytes
SHA-256: 14af9447edc53b6a69cf7798927c54cecdd7945346ea0952abea32b8ef517cb0
font_02_sfnt_off00011f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1