Malicious PDF — malware analysis report

Static analysis result for SHA-256 e358b6a778ab5ac6…

MALICIOUS

PDF

85.2 KB Created: 2021-10-06 11:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bb780fa5b2f20fc2f593974536c0340 SHA-1: 8c62049ae64016141a6befaf6fd4baf2f8dcd5a0 SHA-256: e358b6a778ab5ac63afd9b0584bfeacd07363e25f4ba120bd345734397a0a034
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites. The document body was unreadable, but the presence of many links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://midel.me/userfiles/file/gifolob.pdf
    • http://kidneytracker.com/ckfinder/userfiles/files/jifivebe.pdf
    • https://samsungdvm.net/upload/ckfinder/files/91692623369.pdf
    • http://hnkingdee.cn/Files/file/2021913191455.pdf
    • http://filtrydokoparek.pl/img/all/33523931051.pdf
    • http://1carl.com/userfiles/file/lubaviku.pdf
    • http://ain.proximeo.com/ckfinder/userfiles/files/wegisapugexanor.pdf
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/68298838661.pdf
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/finewos.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/60236635211.pdf
    • http://riverside-plaza.com/upload/userfile/files/kesebizubavidazawa.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/28828411648.pdf
    • http://wami.cc/data/files/fokobosuxakurapuvevovifof.pdf
    • http://technimexvn.com/images/ckeditor/files/72821181784.pdf
    • http://buyyoutubelikes.com/ci/userfiles/files/kupifukom.pdf
    • https://asp2.aiwangyun.com/ckfinder/userfiles/files/60911046933.pdf
    • http://www.fonfe.com/uploads/files/33884198733.pdf
    • https://soccerauquebec.com/userfiles/file/9278036330.pdf
    • https://thuhuonglacquer.com/uploads/news_file/29356371094.pdf
    • https://www.igescanada.com/ckfinder/userfiles/files/66822875158.pdf
    • http://fatfailogistics.com/fckeditor/files/file/68150274066.pdf
    • https://www.iieng.org/editor/ckfinder/userfiles/files/785292920.pdf
    • https://dongcohonda.com/userfiles/file/vopirugovatozowin.pdf
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/1963157514.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=autism+and+seizures
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaa1.bin
bfc6487de393bb5d054dee748963d37be743040da6f6c1c02980ceb8b6cbbd60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 10384 bytes
font_01_sfnt_off00010220.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10220 16792 bytes
font_02_sfnt_off00011a32.bin
ee8a0ec2c2fb50fd54bceeb6273c0f6ad1244e16af6a19d2a8a145d5c9f67777		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A32 17816 bytes

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