Malicious PDF — malware analysis report

Static analysis result for SHA-256 29483656a7525dad…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 09:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9f65ac9fa4ab5a8cc461ffcda4f9e67 SHA-1: 245d75580111196a8518cca116396facd1b84399 SHA-256: 29483656a7525dad99ba6c5bcf2c8eb157bd8cd4b3306d576eb3762b4a876c34
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://inwebjor.ru/uplcv?utm_term=nfl+mobile+for+android
    • http://malir-naterac.info/UserFiles/File/20654589260.pdf
    • http://goldcoil.com/uploadfiles/files/96642358431.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f51f428eba---68546243055.pdf
    • http://thesecurityguardunion.ca/userfiles/files/datowubijivimeridoba.pdf
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/nesixufude.pdf
    • http://c-six.it/userfiles/files/34554581803.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/muforimibunugefelovoxab.pdf
    • https://nguyenhungstone.com/uploads/image/files/75576392788.pdf
    • http://7seapharmtech.com/Uploadfiles/files/wenowekum.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4f34813bd2f6340336d4380b14b1af53/mupubawepakadatizopujodu.pdf
    • http://avrig35.ro/uploads/fck_editor/file/77892463821.pdf
    • https://shevtsov-art.com/uploads/files/24390913253.pdf
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/rutepamadijiwibened.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdf2acbabf---21840962088.pdf
    • http://aircond.md/upload_fck/file/32857494091.pdf
    • http://nicolalazzarotto.com/userfiles/files/fogedosekovox.pdf
    • http://fiumevivo.it/userfiles/files/xiwoleposomarulusotolul.pdf
    • https://audreyheselmans.com/_files/file/nuguvuridune.pdf
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/66200551062.pdf
    • https://ryokanclub.com/FileData/ckfinder/files/20210902_A64B72BCD7133719.pdf
    • https://confidence-ist.com/ckfinder/userfiles/files/kunirinugoxokevajasimi.pdf
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/1410177468.pdf
    • 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_off0000d9e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 16792 bytes
font_01_sfnt_off0000f1f8.bin
b2071bb4c765d4156e45402b44cf12784584622988366e697be94487789734a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 17948 bytes
font_02_sfnt_off000120c3.bin
d6d9b539971a67712c8c530230410241b13056fb36431bc629c4ec2b343cd165		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120C3 10368 bytes

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