Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf71ec2cb306cc5…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 12:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b798aad1310ef20d362a2ff7b0b0a760 SHA-1: e22754f14784de9daec24d3ccbb801360b1ff2ef SHA-256: abf71ec2cb306cc57b1f7569bce77b74537b914c63dff4222eda97220d27ca3b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were directly extracted, the nature of the URLs suggests they are intended to lead the user to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=a+history+of+magic+by+bathilda+bagshot+pdf PDF link annotation
    • http://an-ocn.ru/ckfinder/userfiles/files/85621058188.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/titimaxapapa.pdfIn PDF document text
    • http://vln.nl/files/file/kefawigoxisoliwir.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/15182647190.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/35300388224.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/zezadozeduriwitid.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/80762888642.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5ca06c81---65393702619.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/miwewedulusivef.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/sivobemokidepe.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/podoworo.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/bogufurarimoxewaj.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/527aab9396e6f600748336edfa74968a/78197749799.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/pupozinuruzul.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/97422486843.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/68389156873.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/didonoko.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/kuruzaj.pdfIn PDF document text
    • https://iwistw.com/upload/files/44328177522.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/83806979983.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/34450734143.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/29323882711.pdfIn PDF document text
    • http://sdes.in/uploads/gemis.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/pudenatoxibezijuzum.pdfIn PDF document text
    • 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_off0000db53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB53 11064 bytes
SHA-256: 43671d69e26f572401460ec4fdc399dc8e3c5316586e5f3469f677d18b4ab32e
font_01_sfnt_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 17744 bytes
SHA-256: e551d52676ba572deb89aff0743be643be90d97ce307f502d819dea745bae965
font_02_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1