Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb177383fc4fe0a…

MALICIOUS

PDF

95.5 KB Created: 2021-10-08 11:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c6f5d1d097acb36f5ab05e45894d62d5 SHA-1: bf3fc2d0c2241d11407ba923af0e473d01bf2cf3 SHA-256: 8fb177383fc4fe0adf946328523a02b9b798dfdaf85910c0192cd4672319d255
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for phishing or distributing malicious content by directing users to a network of disposable sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://zmiz.hr/userfiles/file/65039707355.pdf In PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/40158142855.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/65798943919.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/41455933561.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1633233187.pdfIn PDF document text
    • https://fobh.net/userfiles/files/bewitusabewoj.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///muxefumasatiliburenijo.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/vikunugagujibepazufeza.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/36843202103.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/59740316269.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202110/file/2811122300.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/jiziz.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/ladubasesi.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/dobositikona.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/7180098764.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/jerutuwugunifajejezozo.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/lufeparuwumubasogekoj.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/wowogowazewamaj.pdfIn PDF document text
    • http://4yoga.by/pics/files/58969410107.pdfIn PDF document text
    • https://phukienbep.net/media/files/12113536015.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/61569209768.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/17259824316.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/v6a511vpgtip20ljuhsdk8fnt9/xidumoge.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/55521754973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=i+put+a+spell+on+you+lovecraft+countryPDF 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_off0001079c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAE 21980 bytes
SHA-256: 097ae5c955ebefb523058dd92ada00767799a6c8b7edd1a89190d7fc8cc96fa2
font_02_sfnt_off0001581f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1581F 10612 bytes
SHA-256: 84f1d618fcb5b89e9f579821a3df579c98b4d095c221d23e6e4aa400ec5c40cf