Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4ab0694dbcbc41…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 00:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ed7c5f92bab7e468d8b8a5e4974dae97 SHA-1: dca30b8ca68f13bae5484327f90ab0f8aeb77d0f SHA-256: 8a4ab0694dbcbc417e79793d03170579e1c3d7f7c1f2cf44cc3dd4047a45203e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nomayaku.com/userfiles/file/23025772789.pdf In PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ede8de15b---kilezufa.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/bufidewavasovis.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/lemurozozeluwane.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/gatofigosatopalisud.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/57636077546.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20219121826501275.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/48430163355.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/2668012994.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091605063971.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/lobaxokivopisiwix.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/fubupoto.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/28358695626.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/lijeve.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/dipaputuvuzuvelil.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/tumorivevosuranavim.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9f5d0515e---jukaloliwipifogesolopefi.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/gunorutavafutavevinaraku.pdfIn PDF document text
    • https://windsbs.biz/files/file/97751907493.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/42800720605.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/45531117221.pdfIn PDF document text
    • http://handgun.ee/media/file/didonolofezugopisugoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=spider+man+far+from+home+full+movie+in+english+onlinePDF 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_off0000db07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 19052 bytes
SHA-256: 00ec15529a5f574ed63bbea59fdfcf35cfa6ba8ee20bc130499a4ddd1b1e4053
font_01_sfnt_off00010ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 11088 bytes
SHA-256: 3da86a8f7cf4b4c86c2615b390cb8796d034fd9905caee6510f4ffcc9185afc3

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