Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc88c905b7e188c…

MALICIOUS

PDF

69.7 KB Created: 2021-09-10 08:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dedc8e97b266b1e99ba861dc627d3d53 SHA-1: 3e502719299c10804f372ca1dd182b5977aa120f SHA-256: ddc88c905b7e188c7baae0de5255e921417989a9011cae15f75dde3c830d68ad
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded links pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and the presence of external links are indicative of a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=calculator+hide+photos+and+videos+app+download PDF link annotation
    • http://come2menorca.com/images/file/rafepid.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/50601066213.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/65663581867.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/fisujapizoxupukako.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/49957238578.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/gumidoba.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/48250832213.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/54129095877.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/tepubopogel.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/binabirowipan.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/93873743359.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/86653922722.pdfIn PDF document text
    • https://norservis.info/files/files/jolawimekoresiwefuki.pdfIn PDF document text
    • http://watch62.ru/files/files/43264406113.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/supudawejofutivejag.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/bopofemunip.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/zanalavoreriwuwen.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/35403925254.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/jogajipemi.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/62620966246.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/76534956112.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/30037784955.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_off0000af7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7A 10892 bytes
SHA-256: f1d5bed12e896e9b7b16d873d0673ac2e798a8d1d580c8d18953396f1bf3b8dc
font_01_sfnt_off0000c8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 15796 bytes
SHA-256: 727dc76559cfd60176e34d848b5962279a4ccaeb9e198b7cbe2e7440ce2c94e8

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