Malicious PDF — malware analysis report

Static analysis result for SHA-256 6458295ffa9ad71b…

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 02:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b56cb800e0bf82b81d44b422840fdfb4 SHA-1: e25c7f851f66b768c5d61a6a6184b276e6d0e229 SHA-256: 6458295ffa9ad71b0164e79a3cd73e0d033426230109032d2a4c952554e7b2e4
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=among+us+game+online+play+free PDF link annotation
    • http://weifong.tw/fckimages/file/purenemezikoladifo.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/bosumukezogubakafaket.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/87490225419.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/zufadojatovor.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-7/20210907024401593242.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/nazez.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/96245414478.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304205422fe---22456717135.pdfIn PDF document text
    • http://juentai.com/userfiles/files/11498055031.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/93081588059.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/62057713372.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/82369837464.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/fazatimibe.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/56457189661.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/gidomisifixadobimig.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210910_C47EFDEBDDDA3778.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/20354238335.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/mikodeva.pdfIn PDF document text
    • https://penal-garazh.ru/files/luwujojesudiwajowasu.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/welomorisij.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/pajoruw.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e60c67bc68---semafulizazateluxofovawen.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/74891377749.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/67527691890.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 18248 bytes
SHA-256: b5535d9300352dbf7b96b23e5e3d407bda0485f5c2cd23046a6e4f0c05a33527
font_02_sfnt_off00012648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12648 10796 bytes
SHA-256: d79ee6572dd1e9d26fbff722ddd26f841ebc43e3ad0f77f7e14c6a6ccb14f234

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