Malicious PDF — malware analysis report

Static analysis result for SHA-256 8771827630768518…

MALICIOUS

PDF

81.8 KB Created: 2021-11-08 13:56:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 88d6c9c5df0b57d53d3a3c921c89f369 SHA-1: 95b13566066a1377f86b36392ce44190fe4cadcc SHA-256: 877182763076851882393bc8628e1c35f72b6b0c719898c635077f760507fb58
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://queure.ru/uplcv?utm_term=lesson+3+homework+practice+solve+equations+with+rational+coefficients+answer+key PDF link annotation
    • https://vico-immobilien.com/ckfinder/userfiles/files/91019231053.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/80990991907.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b975053a2f2b3ce517206ef163e4b5f6/fubafejilaberuri.pdfIn PDF document text
    • http://theshop24.com/userfiles/file/25758083917.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/12980575523.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/3630728748.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/xorojugubun.pdfIn PDF document text
    • http://freetds.net/userfiles/file/xabagorewijozirani.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615249345cd9c---44040197615.pdfIn PDF document text
    • http://aaaa.handyfriendship.com/upload/files/kuzibedamevabajatoxu.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/zobisuj.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/toruwudifodokiporolerif.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0795689001634749205.pdfIn PDF document text
    • http://organizeteknik.com/userfiles/file/77113624760.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/51018037778.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/71011307025.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/dulosanixaboverobusav.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/jilovegorawidabixu.pdfIn PDF document text
    • https://rugsdirect4u.com/uploadedfiles/file/53092886514.pdfIn PDF document text
    • http://soles2walk.cz/data/file/39967749329.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/sipowogotikimexarateti.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/7559152742.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/22765817163.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/36929481321.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/48458359013.pdfIn PDF document text
    • http://creationart.hu/files/file/wedadakodonegem.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_off0000d354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off0000ea7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7A 11480 bytes
SHA-256: 5455689fc276e471375c54880869a9774d66bdeb38c9179518510f9ccd7c158f
font_02_sfnt_off00010593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 18772 bytes
SHA-256: 9982a9fa1321b93a30df7f677a4f43e548a2db799f10e70caddbdc585cf0b68a