Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a852ef2488bf37b…

MALICIOUS

PDF

85.4 KB Created: 2021-09-21 17:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c90aa13a867a63af9f35c5d9853442e SHA-1: 4e9ea95a773dcdaf590cf179902cebd09bb2d770 SHA-256: 6a852ef2488bf37b9d0bda63956cf83401eb282eea98c28a392f2a380fa186a7
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior.

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 https://coretry.ru/uplcv?utm_term=allsmo+like+instagram PDF link annotation
    • https://learn-atdi.com/uploads/files/35097890355.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/lujazowubipurufimup.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/gosorinajare.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/rukomovomaboginojo.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/77668327070.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/wuxudadopenepajanuzoxe.pdfIn PDF document text
    • http://rongqichem.com/upload/files/42978843529.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/34289042542.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/92642251851.pdfIn PDF document text
    • http://atrsara.ir/resource/files/97553920764.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/rividetenowatikor.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/27878495950.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/29963316786.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/94473378886.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/jonovezotobelukenejadekuv.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/basonewi.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/sagexufedimubuxivasago.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b84bc50853b9d751a9005de6e8bee60a/fibixojikepizikujawevenuv.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61741426176.pdfIn PDF document text
    • http://sakem.org/userfiles/files/vigujonilagigaxuzekoweme.pdfIn PDF document text
    • http://status.cz/UserFiles/File/74122391822.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/sotukofese.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/luxajisi.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/lapurubutefuwowezilo.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_off0000eb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB05 10524 bytes
SHA-256: 08057e8bfbba80b7f895138017d990cac4cf01cf0828fb847e0378840e2f02fe
font_01_sfnt_off000102fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 17580 bytes
SHA-256: eeabe14cc342d44b4432488b317176210e283aed76f71e1d1420c4890b0f04f5
font_02_sfnt_off0001307b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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