Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c025b36ea0504d…

MALICIOUS

PDF

71.8 KB Created: 2021-09-09 22:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 197c7a5cd136cf5561525855e068b3df SHA-1: 6acc99b4fe7395a54f8b12c17e84c40b4fe7c732 SHA-256: 88c025b36ea0504d6bf6b34e4e5749afebc0cea06d16b90af6f1355f9952652f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple external URIs, including one pointing to a raw IP address, suggesting it's designed to redirect users to potentially harmful sites. The PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mosconi.net/userfiles/file/fapovapufoxudumodamo.pdf In PDF document text
    • https://maintogelonline2.org/contents/files/tonugokivemosumevi.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161373705b3204---lagewiwapu.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/90356869181.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/67243191857.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/lurokaxemoz.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/kelumab.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161308cd9d174d---69609452472.pdfPDF link annotation
    • http://crabandclaw.com/uploads/files/jepolabobolawumomefuf.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21255871908.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/48199298646.pdfIn PDF document text
    • http://vaynhe.com/upload/files/11372947738.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/52256893728.pdfIn PDF document text
    • https://digireg.at/upload/10125373007.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/bovawagabu.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/bipixituvanidet.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/jatumaruxilinuwefupiguv.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/nugux.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/21635756464.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/58207576340.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161320be1aa05d---bovakixanitarumegiju.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/zebixuwidipusopubegufaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=iptv+perfect+player+apkPDF 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_off0000b704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF1B 10212 bytes
SHA-256: 54c89342e27f349a5a1d7a756b5bb95990b4f0631e235acd88baf6cb46d20248
font_02_sfnt_off0000e63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 16832 bytes
SHA-256: fa98bd11e61b476e511621e8b0069834fc26d83bf70f97a27accee37e816dad5