Malicious PDF — malware analysis report

Static analysis result for SHA-256 02d71f564080dfa2…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 00:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f324e22f63f5825f9a20827d50897324 SHA-1: 2bdb87ca05c7c1faed1fb4d018dc5c30ff89d283 SHA-256: 02d71f564080dfa2f2b0c4da66ceeb7177e2f614ff8800f58381966eaa81f04b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It functions as a link farm with numerous embedded URLs pointing to external sites, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern of using disposable hosting for a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=candy+crush+android+1 PDF link annotation
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145a2c0af70a---lurokobojafatesaf.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/babiladekuvafifano.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/vanodunuvasiwujoputima.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/77iaf7ib9breq9o87edccvv0sd/68944292145.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/5224153392.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/xupetoxovoxufiropowu.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/kifuwujopegunit.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/noboleluxilelozi.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/dopezi.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/84089524811.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/duxuxizene.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/74469389300.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/3206422244.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/80332992162.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/15626823553.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/78594589855.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/kupugivodazivefevejabi.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/zidisubavaxowijupovakev.pdfIn PDF document text
    • https://kapefashion.com/files/files/fupipefomujoganapili.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/nanuxenuwer.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/tedazagomobebakegoxu.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_off0000d717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 10488 bytes
SHA-256: 701653f50d90886ecd9a6ff348b96a52f58c35455f830385d6ee9d57e7806bd6
font_02_sfnt_off00010701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10701 17432 bytes
SHA-256: dbbd0ae65e638609cced4ef12114afa62c63f9317ce1cbfef734c565eb88b77a

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