Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bed56d3d6915d02…

MALICIOUS

PDF

81.4 KB Created: 2021-09-23 21:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ae82cf59c4ca2069cd21548e75a5017 SHA-1: e0566e067c91a030b5c822afc0f45f6da00316d9 SHA-256: 8bed56d3d6915d026eea378113ef42d0c9ddeba5bac67ecd3abb478feab0f29c
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence, indicating malicious intent. It contains numerous external URLs, many pointing to PDF files hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://thaihotelsale.com/FileData/ckfinder/files/20210917_B4357D1593708CDF.pdf In PDF document text
    • http://dhleisure.com/ckupload/files/luluxazavuzabefoxik.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/bufupijamepusibalirewotot.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/voxujixifetugorukumi.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/36393004178.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/vazasogovojepirakorumugi.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/mozadonefetedodisedixa.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/dalonipumunan.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/lenikudabu.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/buxajojuviworupikiwi.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/nufarikokodomizerowililu.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/zozuguwogiwixejo.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/88365746757.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/78287796692.pdfIn PDF document text
    • http://novichiha.ru/pic/file/20364068959.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/filafotitalabo.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/wodexemirabawakege.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161318b8382a59---xutinoxovagalono.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/95273334761.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/96072275953.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/8912051014.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/venovepefuvikobagoloruwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+evolve+trade+pokemon+on+emulator+androidPDF 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_off0000d5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 18680 bytes
SHA-256: 6e97e9727aa8f54f400efc7a80d1e98015b88aec70623b9969a45ce4de78597c
font_02_sfnt_off00011f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F23 10720 bytes
SHA-256: bf5099cfc1e85bd619dbd27f626278b06c7235fa4b10cb734de57c316cfb58dd

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