Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98fe2fa520a57e3…

MALICIOUS

PDF

73.1 KB Created: 2021-09-22 20:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc07fdfb255dbeef0538b5beccf14da1 SHA-1: 0196d9238f0c983cf604c63c85b8e3432050129b SHA-256: a98fe2fa520a57e3c677839d4d1e41dad6ad4b7f22e1bc0f68b939fa5e5951cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://archism.ru/uplcv?utm_term=la+crimes+android PDF link annotation
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/81cd0cb0db6e0f58a8b033d0e5af229a/tenolemi.pdfIn PDF document text
    • https://datenglagi.com/contents/files/nulaxuwez.pdfIn PDF document text
    • http://markone-tools.com/upload/files/11662791780.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/50430221000.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/kawusukizitif.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/wijaziwejoloto.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/46656624096.pdfIn PDF document text
    • http://budka39.ru/files/xadabogabafofaxifox.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/77898407962.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/11324152141.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219841227777.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/sutuwiwasiw.pdfIn PDF document text
    • http://chinastom.ru/userfiles/file/31895884134.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5dcba020c8131bdd45883b7114bff616/fitaseri.pdfIn PDF document text
    • http://gibisch.info/files/files/fekegemasukiporelozil.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/25598997601.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219485241.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/81225492649.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/jefemesurisogujuduruv.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/vofuwusebonexe.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/zurupa.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/koguzovoniwosakatuxodesu.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/ferowapuxelidagim.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/46677189605.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210919075522.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_off0000bbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E4 10344 bytes
SHA-256: 8a14c081d6d707732c9aac4d5639db3229f5022254546be95303c1bcec97d5b1
font_02_sfnt_off0000eb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 17472 bytes
SHA-256: b46942326f3ccc71ce83df4d6f988b4ec2fdf4fedf03bcdab9bfcccd1297c8d7

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