Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aed29f18e1b01f3…

MALICIOUS

PDF

81.9 KB Created: 2021-09-16 01:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02211f476bd3d5e6f0448ee06b3fa96c SHA-1: 941e2d5bffc958534276029497b30e95736a65b2 SHA-256: 5aed29f18e1b01f310268652ef5703b12eaf8c54c1ddf094bcc74ce3e15b6ccf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of disposable hosting for PDF files, reinforcing the phishing/malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gimhaejazz.com/fckeditor/userfiles/image/13487970187.pdf
    • http://hongdanhaudio.com/luutru/files/wavenozokivaganosuke.pdf
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/gunimelumirotepadaziw.pdf
    • https://semut73.com/contents/files/sikaxutudagoti.pdf
    • https://mintedimages.com/ckfinder/userfiles/files/fuwovekuxofemitoteponujik.pdf
    • http://worldofpacifiers.com/editor_uploads/system/files/45664372966.pdf
    • http://hanahana.vn/media/ftp/file/tofimesatakukosufezelij.pdf
    • https://annekienlen.fr/imagesfile/88180864912.pdf
    • http://cissi.it/userfiles/files/24684553038.pdf
    • https://unitytradefze.com/ckfinder/userfiles/files/69041569182.pdf
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/fovokafemisuteduve.pdf
    • https://aokman-drive.com/d/files/seruwufosepesapikani.pdf
    • https://ctapigroup3.com/contents/files/wugut.pdf
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/seluvok.pdf
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/73270615613.pdf
    • https://dolupin.com/calisma2/files/uploads/3453161646.pdf
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/buxabuzesikabufo.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vajekotideparewiviburox.pdf
    • https://smartech.lv/sites/smartech/uploads/documents/files/21488828600.pdf
    • https://812423.qqtogeljackpot2.com/contents/files/mezabatidavomelamogup.pdf
    • http://alarmy-kamery24.pl/userfiles/file/woronugodupo.pdf
    • http://nakamurasangyou.jp/app/webroot/uploads/files/motosone.pdf
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/rajowajinerunuvinulipox.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=can+i+login+to+icloud+from+android
    • 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_off0000d4f8.bin
9417df1868958fd1df10fc5b625b39f11208117aef8f451160a9478b787fb15f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 20084 bytes
font_01_sfnt_off0001098f.bin
f204f78315f94a40c5b93f175f2a5f0f7b870de0f79778d1e4aa6efd5018361f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 10652 bytes
font_02_sfnt_off000121b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121B9 16792 bytes

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