Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e8607727df443b…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 15:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0db53e57dfcce384a9fda95ad2efb1c SHA-1: 5110fbe11f1994591e0c31d7369bd307c7a42a86 SHA-256: 76e8607727df443b69570eca565041c9e291d5fe54d69e804e3628d9ba156b0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism to distribute further payloads or conduct phishing. The PDF structure and embedded content are indicative of exploitation techniques, likely leading to client-side execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bayihoki99.com/contents/files/guxotewaza.pdf
    • http://qiuyutv.com/userfiles/files/20210923032134.pdf
    • http://kengosushionlineorder.com/uploads/files/gozenibipezewuj.pdf
    • https://tselectromechanical.com/uploads/CKfiles/files/97199472572.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/28809581801.pdf
    • http://astprom.ru/sites/default/files/file/87497767365.pdf
    • http://kovospm.cz/fotky/file/rajokutovek.pdf
    • http://np-laser.com/upload_fck/file/2021-9-1/20210901210131679353.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614f71e022991---56746882944.pdf
    • http://ranchobg.com/img/file/divetiwovitez.pdf
    • https://olajpark.hu/files/files/kedafozanewa.pdf
    • http://pure-chiral.com/upload/files/wodasamatolemefalogiwi.pdf
    • http://dungcumaymoc.com/Images_upload/files/49098053371.pdf
    • http://mlead.net/images/e/file/noxapolomag.pdf
    • http://lachambredechos.com/userfiles/file/88718290488.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/31697647720.pdf
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/66669493539.pdf
    • https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/zetuxuxakasudas.pdf
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/43531408006.pdf
    • https://xuantruongtech.com/images/ckeditor/files/tapebulonuz.pdf
    • http://taixingchem.com/uploadfile/file/20210907160202054.pdf
    • https://allcreaturesinc.com/files/files/wopadadawufuxotap.pdf
    • http://deltools.com/userfiles/file/judalozegadizojarokaxapi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=a+rose+in+winter+full+movie
    • 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_off0000b1fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FE 16792 bytes
font_01_sfnt_off0000ca15.bin
b1edcb2e3267df1a78c5024cc39ea97570bc1564563f16201ee049b30bc37c5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA15 10448 bytes
font_02_sfnt_off0000e1da.bin
2f1962ab7878a552045a69ba169b4e32abffd582e50a1d04ad47a09dce7bedc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 14944 bytes

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