Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27b65a0422907e4…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 09:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 241cfbf9c3381d6bb5a5ee5f1b1cdd40 SHA-1: b053c54b505bb4e3d923d0341bbb738d6ce4b821 SHA-256: b27b65a0422907e4fbe5905b2c28a7e89179c8d5c2f24cce7c49275d0f1469f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://di-tech.kr/fckeditor/userfiles/file/wuvawoguzapade.pdf
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/lexifizujupi.pdf
    • http://alisawedding.com/upload/users/files/jalivolesamulufuxelawe.pdf
    • https://emenu.hu/editor_up/49489697005.pdf
    • http://liveisagenix.com/ckfinder/userfiles/files/kakexijejox.pdf
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/jojinigijuw.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d97e8cfeed1c1e980f5bf3efcb3e6ad2/puvafipu.pdf
    • https://ikitellirezistans.com/upload/files/sogaxerutijowelapoxoloweg.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e9a341e6f---pusijorol.pdf
    • https://amzentransportationindustries.com/admin/imagetemp1/file/tojekomukoverito.pdf
    • https://adtw1.com/ckfinder/userfiles/files/xelijebufowabon.pdf
    • https://wolfgang-photography.com/userfiles/files/27255038782.pdf
    • https://profession-your-dr.com/uploads/files/202109090209185354.pdf
    • http://hiniceshine.com/upload/65377141504.pdf
    • http://indyskischool.com/ckfinder/userfiles/files/pesonefa.pdf
    • http://szerecsengyogyszertar.hu/editor_up/56984816700.pdf
    • https://hotelexpert.ro/uploads/files/podafirijivavopawebez.pdf
    • https://thebottombillion.org/business_school/uploads/file/noboleluxilelozi.pdf
    • https://webshopplus.nl/app/webroot/files/userfiles/files/nenijatozatog.pdf
    • http://chip-chup.hu/upload/file/leroso.pdf
    • http://www.tivafa.hu/upload/file/banarakezekafezuri.pdf
    • https://lemarko.com/userfiles/file/tavafejaxawire.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=traffic+racer+android+game+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c937.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC937 16792 bytes
font_01_sfnt_off0000e14e.bin
35c3f6d25176dac26965ce4ef6d714dbe3417ab8b19a87b5868c078124bf5fda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 10604 bytes
font_02_sfnt_off0000f953.bin
1492cd7f2a681682c00846c6e460bad0410db91e864fddfb082a4211395e8d45		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF953 19188 bytes
font_03_sfnt_off00012a13.bin
ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A13 1820 bytes

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