Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aae9365069febf0…

MALICIOUS

PDF

88.1 KB Created: 2021-10-05 18:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3a8f41c9de141a703acd6ee8e9a990f6 SHA-1: f5707fdf828b2fa4731e895f7a167ab6e99a962c SHA-256: 0aae9365069febf058a00517b49f2d89696f408db64ba54eb72a18d2af5120fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host a large number of links on disposable domains, a common tactic for phishing or distributing further malware. The embedded URLs point to various PDF files hosted on different domains, reinforcing the link farm characteristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://baigeleather.com/userfiles/file/43874214905.pdf In PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/93408740774.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210911003351.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/xuzatagirofid.pdfIn PDF document text
    • http://bienbao.net/uploads/files/23403803888.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/datoposebubijufovuridu.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/54579715008.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/gegatajiw.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5b2adc817---29839699133.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/repezaturixis.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/vebonalew.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/96893111845.pdfIn PDF document text
    • http://na3.it/misc/file/85364097927.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/86003301176.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/10527432673.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/86518037998.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/78274732125.pdfIn PDF document text
    • http://hzhuacui.com/images/upload/File/70667858313.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/vitaforobinawupuxug.pdfIn PDF document text
    • https://asken.as/bilder/file/popezavebajivosiremiraj.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/57285341591.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/41976968753.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/14111357003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=dilation+of+a+figurePDF link annotation
    • 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_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E2 10324 bytes
SHA-256: 7161d0d32c3f163230fcf376a7a78b5c0c99e884f3f0cf705e76b67711756fbc
font_02_sfnt_off00011a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A43 21512 bytes
SHA-256: 49d5fe93414f7f21079760d5b266d3af7ea07a416ee5b68c5c0ec39606a29bcb