Malicious PDF — malware analysis report

Static analysis result for SHA-256 22f3c1185ebb70e8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 03:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a8722086f346b017d9b92ec35de1d238 SHA-1: 11296c0da929dafb15f108fe2dfd51a84e3a5101 SHA-256: 22f3c1185ebb70e8477e7cfc1a2055b123d2d0b9e5bdad559560975243b48fd6
126 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, indicating a likely attempt to redirect users to malicious content. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://pvvc.cz/files/87367908213.pdf In PDF document text
    • http://baihsad.com/userfiles/files/20210919_150323.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/sibenaraxarusokijekibu.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/88145864452.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109061917058333.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/xukizo.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/gatumiliditofatoxobaweba.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/34061028310.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/kilakuzimomasaluma.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210907024932.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/79393487812.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/nazerusozitonunibaxibemoj.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/ridujubimurosewosumuvefew.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/nomabilis.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/91755051812.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613afed96643b---torirazukebipokaruxot.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/bixakoxakalitujulome.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/061248567010.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/47006415111.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/74266203111.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/19001806676147387b2d766.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/78453558038.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/bewotososose.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/nugenigexujit.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/levow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hack+fs+18PDF 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_off0000e265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE265 17344 bytes
SHA-256: 98d4587a06a9e946fbd1498a93b8199abf07f45adb00222e6e858822f806d949
font_01_sfnt_off00010f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12735 9980 bytes
SHA-256: f6dfff8ab05917f24bfb4ff884021a4aa55f2d708f5d4172a62481b4392a7382

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