Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23330f6c1aaa102…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 10:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 223befaddf7d730ba8d0fa9a82cff096 SHA-1: 9e03bcd8b435c2a095f66d845195eb9827b58bb0 SHA-256: f23330f6c1aaa10275b5ec66173a77f3b8277f9201f95e750eb478fe57087db3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which lead to disposable hosting domains, suggesting a link farm or phishing lure designed to redirect users to download potentially harmful content. The presence of external URIs and the link farm heuristic strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=download+pi+music+player+pro+apk PDF link annotation
    • https://godahoian.com/app/webroot/upload/files/90520795548.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/79250319270.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/12657270570.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/turomixaka.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/putejurogikaziz.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/47098035653.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/mominita.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/36627821379.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/43159324760.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/24407084724.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/dizavigupofosumamaziluvi.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/bojufe.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/83031137055.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/jakad863mb14df0e3nuhocph51/16980710083.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/31818807082.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/duzopexafatodubaxonunu.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/3551436988.pdfIn PDF document text
    • http://wirheiraten.de/images/file/zajej.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/kipaxezijubetudasujuraj.pdfIn PDF document text
    • http://abwessex.com/uploads/files/zukufewojunazitinajeden.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/99620544674.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/11805146898.pdfIn PDF document text
    • https://duvanco.be/docs/files/37667323359.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_off0000adeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC602 10968 bytes
SHA-256: 02bb4178734fc9b34c3edf9fec475da0cc4201606c5d33d621b4a7d62601e5c2
font_02_sfnt_off0000df7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7B 15736 bytes
SHA-256: d1071835447ff959ea55857cdedd51deec513095421c461ada56a219dfc7d546

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