Malicious PDF — malware analysis report

Static analysis result for SHA-256 818c878b1db16f82…

MALICIOUS

PDF

67.6 KB Created: 2021-10-03 04:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d11a27fc6a510bb34e3f842edc94b916 SHA-1: b6955b736def30e9ee7fd0075118859994e4ba5f SHA-256: 818c878b1db16f82411255fcc5a42b709e3e86af9e17e996ff423ade9e7171e7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as a phishing lure due to its image-heavy nature and a clickable link. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack vector appears to be a phishing attempt, likely leading to the download of further malicious content via the linked PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ab79d2577---65743431622.pdf In PDF document text
    • http://architettoseneca.com/userfiles/files/fapabovugof.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/3920048703.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/donexorakulokojovogewuk.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/lofowelegexawilivaxadora.pdfIn PDF document text
    • https://istanajp.com/contents/files/nulodidajaxapebi.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/lobumixu.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/taxokifezowunikeg.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/75183872355.pdfIn PDF document text
    • http://ave-france.com/pics/files/valumixirogixozuzedina.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/gevelas.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/xenapaxefukebisipabipo.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/80279976418.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/mekunanavab.pdfIn PDF document text
    • http://marymo.ru/uploads/files/47224276525.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/90108210113.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/50382330226.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/vanibilalos.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/57681176951.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/lagaxabajulurozugesujarir.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/nivadozoputuzutegeraj.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/bibitudalu.pdfIn PDF document text
    • http://showdoimovel.com/files/files/mujolumexegaxoforafufusiw.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/24287199355.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/3991585843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=rorschach+test+bad+answersPDF 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_off0000ae17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE17 13920 bytes
SHA-256: 2335214735d64679e9542f8ccf05bfa18c5031beae4d0a3091e59718f79f617e
font_01_sfnt_off0000d0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D3 10600 bytes
SHA-256: 65be2b6eb4a8483c23b0b79329544bcdd58c29b43bbe2bb7ced2014ee689c958

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