Malicious PDF — malware analysis report

Static analysis result for SHA-256 da00b18f5ce1deae…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 07:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 14b23a953cf815a3e1169727d9092964 SHA-1: 98550f3764399dbb9c8c194fac305bbead163612 SHA-256: da00b18f5ce1deaeccbcb87ac4b22b0eb572f85ded68cd96f3c6c179b13a5147
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. The document body is heavily obfuscated, preventing analysis of its specific lure, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://umhouses.com/uploads/files/89410467198.pdf In PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/83419554273.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/jutosevotemakewakori.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/74719127387.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a2ce382365173d423885da0083df1198/nufalutuba.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/fenerorirubamiwilusew.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/jinofozuvub.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/94216148069.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/30077332350.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/3050775820.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/35074011634.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/fukur.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/30477368927.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/dufiwoxevujiwonupe.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/tivanolumadukipirif.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385444670d1---64336613631.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/41695338657.pdfIn PDF document text
    • http://rurisnet.org/images/file/82113926478.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5e42db737---dosoxabosilonipopow.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/70147913828.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/88333155241.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/mafokabutujekuwas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cara+pindah+data+wa+dari+android+ke+iphonePDF 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_off0000d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 10484 bytes
SHA-256: d57744fe82cd38a9a3e3be6133a00f50aa1faec13395cba9339a0d034ecf09a6
font_01_sfnt_off0000eecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECB 16816 bytes
SHA-256: 26ae4f23bf3009112cb8751f2d390c2810c87f057fc5ca57519e27bd309e9949
font_02_sfnt_off00011ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1