Malicious PDF — malware analysis report

Static analysis result for SHA-256 af4d52e4bb0d3019…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 14:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8f7167171e6c10a5a91874f8c4bbdd04 SHA-1: f78aa1cb62f60b6d5022d831e878c5b81bd67316 SHA-256: af4d52e4bb0d301926e015db179d0a6a9fdb82d99d15fb76d11dec9410abcb9d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, some pointing to link farms on disposable hosting, suggests the PDF is designed to redirect users to malicious or unwanted content, likely for phishing or malware distribution. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=pok%C3%A9mon+diamond+apk PDF link annotation
    • http://kemmurad.com/webroot/img/files/luzugepesofifijagefel.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/jitabilirugufozeluruxoja.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/73693706412.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/vedusirurasijeliwov.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/59934226691.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/edac9d250264786464fc967cd21e7b75/tubunarimemiga.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210911060513.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/filirodowejo.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/pafokuxaxelalokofudasan.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/zibilirukexobizenojak.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/pamusuzanamipulowumol.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/8826726126.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/70729299187.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/6023412607.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d11fc9a41---77196747339.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/filirowil.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/dixegilezudoboti.pdfIn PDF document text
    • http://355353.ru/userfiles/file/pixipuwulidusiwawa.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/ramulogogivoxiresupuwuw.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/pazosumutabefuwogiko.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/jumikanamadatuvalodador.pdfIn PDF document text
    • http://staropolski.net/Upload/file/voxozut.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/64118311522.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/85706869761.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/74970473060.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/tubibosopozedodalikekig.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_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 17940 bytes
SHA-256: 2441a6ec3de7168baf1cde35c5d3502401bcabfc2c45194509348191e0c35d66
font_01_sfnt_off000108de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 10256 bytes
SHA-256: 8c9212d9cc480287895b97c9d4a0fed0509f5231b9d375b8d6fa88e50a1f4e41
font_02_sfnt_off00011fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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