Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5f75114bc994ed…

MALICIOUS

PDF

78.0 KB Created: 2021-10-13 02:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e39148e443ced6af9509e1495ed835b2 SHA-1: 5f29fd3b4a6f543196d3b708c1e7f7b1a5aa03b1 SHA-256: bf5f75114bc994edfbebf67146673f9bea99ee4807165813de78b5eb6177d8f5
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gcr.goldcrownresort.com/magazine_files/files/41117495608.pdf In PDF document text
    • http://frankifoto.com/uploads/pages/files/49438537876.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/48172687206.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/notab.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/5117665461.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/42ht27et23q3q3uol5cf4qjdkb/fewenowutina.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/42944501534.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/37496118904.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/fazitupizebezovomilokizir.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/73102044914.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616054fe43626---14786075046.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/33988205338.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/72934333194.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/93059758290.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90a6dc1cf---85639842974.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/49271487277.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/64117407868.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210909092541.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/xuwod.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/fujijufiwiw.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/wemexi.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/6774171831.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/dinateri.pdfIn PDF document text
    • https://4u70t3k0-4tl.com/contents/files/rikal.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RhDyTiV0TgQ/uplcv?utm_term=conclusion+for+acid+base+titration+lab+reportPDF 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_off0000c57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57F 18976 bytes
SHA-256: 47d82a3b48696be46cfb17a220a7453dbe4851c07f14010f06e38a6f05f24505
font_01_sfnt_off0000f6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 10884 bytes
SHA-256: 55dba973b32a563c0923fb0e19b53c3c5a85887dc6a7247acd1212f065dc07a5