Malicious PDF — malware analysis report

Static analysis result for SHA-256 458e5ae00bf2d1fa…

MALICIOUS

PDF

84.2 KB Created: 2021-09-20 04:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ca5c566a4a90e62d8298bd9261240ec3 SHA-1: f7c32bbf3e2703e3d2db10ad6eeea5852e73312d SHA-256: 458e5ae00bf2d1fa9a9f6a640af710a88a9527cdf7c19e271b7ca7cf256aba55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://infrive.ru/uplcv?utm_term=best+android+emulator+for+pc+windows+10 PDF link annotation
    • http://banlinhkienlaptop.com/userfiles/file/doxuzoz.pdfIn PDF document text
    • http://didopack.com/files/27047053081.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/93681849051.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/wiwefadapofesata.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/gatagirudasumupugagaza.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090616142373499.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/38196142993.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/jewumurogoselumes.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091913123516.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/74954816137.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/89775609892.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/kodurajepobujikakefu.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/50436194115.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/riwixarelolewafodebo.pdfIn PDF document text
    • http://labonscafe.com/userfiles/dijerumoj.pdfIn PDF document text
    • https://kueapem.com/contents/files/nejubozitepan.pdfIn PDF document text
    • https://dm288.rs/slicice/file/29346831330.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/56281440441.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/pitaginukujulutomewa.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94619207a---jizulituzilepav.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210920_E4E3781DBDE16E4C.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/98067794795.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/zuxeno.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/20638451326.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/17810826139.pdfIn PDF document text
    • http://suriyedostlukdernegi.org/image/files/67622356582.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_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 17656 bytes
SHA-256: 3b06a6c5302e416829b4213359c0645005802f02c441faef2dd4dc4e30b3b343
font_01_sfnt_off00011045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 11192 bytes
SHA-256: d62e915fe503d982b5d4ff7872fd4d603643e3b49f7fa9941237eee06ccc96b6
font_02_sfnt_off00012a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1