Malicious PDF — malware analysis report

Static analysis result for SHA-256 efee03afffdba2a5…

MALICIOUS

PDF

68.2 KB Created: 2021-09-25 16:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bac91d40ea2477ff08491ddfc1490307 SHA-1: 9ac870a580dfb70dac324bad1f8b51981614e5e2 SHA-256: efee03afffdba2a5491d7b72c058cf15efb19f2dbdee9b206aa7ac9f4519c73b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics identified numerous external URIs and a link farm structure, suggesting the document's primary purpose is to redirect users to potentially harmful websites. The presence of embedded URLs further supports this, likely serving as lures for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://oniceh.ru/uplcv?utm_term=ios+14+status+bar+apk
    • http://fxlcd.com/upload/file/zinizubufuxubiruzakujepo.pdf
    • https://presentkompaniet.com/img/content/file/vobitivibasajasawebure.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0aee898a4---bererudu.pdf
    • http://lumieye.com/userData/ebizro_board/file/84815719728.pdf
    • https://chezgregoire.fr/userfiles/dumopoxivedajotaxaputo.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8413836c---56503572166.pdf
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/63892504730.pdf
    • https://snf.styleguides.ch/userfiles/files/89734074830.pdf
    • http://budaikepkeret.hu/uploads/file/17791125232.pdf
    • http://chono.mn/uploads/userfiles/files/74246134536.pdf
    • http://petra-koparki.pl/Upload/file/9198810852.pdf
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/18524197488.pdf
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/65676166318.pdf
    • https://limsurempat.com/contents/files/14896062193.pdf
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/zuwur.pdf
    • http://tongrentangthai.com/UserFiles/file/45114501250.pdf
    • http://royalrep.com/userfiles/files/ligelajoxakivarew.pdf
    • http://xutricolor.com/uploadfile/files/nupekemunetesesapogeluk.pdf
    • http://support-cmu.com/filedata/file/pogesofodokojopisoso.pdf
    • http://dietetyka-24.pl/images/files/24509389132.pdf
    • http://abwingsjanaf.com/uploads/files/45053460401.pdf
    • https://www.abandassociates.com/ckfinder/userfiles/files/63170018275.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF50 16792 bytes
font_01_sfnt_off0000c762.bin
16aac2337941bec747ea97a335b84739a12c0bbce734fc0886668cb18fcfe484		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC762 14648 bytes
font_02_sfnt_off0000ec09.bin
c3037dbaee6bcf4b2864ae3e0249b169bc587e2e95e3f998280e4d8fa8dcabcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC09 10284 bytes

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