Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57dd258225cd04a…

MALICIOUS

PDF

76.3 KB Created: 2021-09-15 20:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49fd034788efe4c7f8bd3e5141f3fb30 SHA-1: b6ff2909aec36f6467575318c6472a3ab5c8bf9a SHA-256: e57dd258225cd04adbcb653ea4faf5abb3d77d69971b3df317b44338e9a57069
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://satellietgroep.nl/userfiles/files/ligobosomoxus.pdf In PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/26953679867.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/luwukum.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/65900673497.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/40b15ffaeb2683b6fce49ddde2099b11/namexuvegupojibejelutile.pdfIn PDF document text
    • http://deltools.com/userfiles/file/didovonipuxokirinopalowe.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/59030507606.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/mogilivonukazuxuxirir.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/nunaribuzopitijumolaw.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-1/20210901091758365929.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/42985588651.pdfIn PDF document text
    • https://fultoys.com/userfiles/zozufugitojiju.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/dalix.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/dibarezoborogujogixiw.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/2772783274.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/sowimipabodeluxemupafuke.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/zifas.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/jinatewekasodutupizopumak.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135d6bade742---44713550287.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/gevirejomobaditufise.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/10821903469.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/9404480158.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/xefomajibabajutopaf.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/48235364193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dog+town+mod+apk+android+1PDF 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_off0000c3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C0 18324 bytes
SHA-256: 3aa0f5936d2e9a2404c90f45586288144c636c8103b786fea434f1586e63bfb8
font_01_sfnt_off0000f3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C2 10620 bytes
SHA-256: 4b6f242e27981bf9750de0f605c9b7fc8cfd27052859a0409bb5d95b2b193be2
font_02_sfnt_off00010be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1