Malicious PDF — malware analysis report

Static analysis result for SHA-256 375304e942f437ec…

MALICIOUS

PDF

78.8 KB Created: 2021-10-05 02:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f6dde761b4ec28a5447910f489151626 SHA-1: 29dce4777ab8ef79cd259d9e90b01e7913b27fce SHA-256: 375304e942f437ec465dae805491d89f545912284850828dbfbd0311dc47f8fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic in phishing and scam campaigns. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further supports this, indicating a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa779f98d---zupibugapijikudegaku.pdf In PDF document text
    • https://greenlandpark.com/uploads/files/noguxot.pdfIn PDF document text
    • https://seikai.jp/free_images/files/96427192902.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0663535001633020882.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/33240638657.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/21223220698.pdfIn PDF document text
    • http://www.pvvc.cz/files/40735700453.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/5811249263.pdfIn PDF document text
    • http://groupkaishan.com/d/files/2548761191.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/19713078066.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/44509595490.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/gabanolelum.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/fawexadokojajusibevowolek.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/temixamidewibarevezukun.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/22015113274.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/fakafizan.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/65812577487.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/mebeziki.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/33754819446.pdfIn PDF document text
    • http://mp-journal.com/media/file/72127997833.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/12317374422.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/20337089573.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/tusuriduzijafaw.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/bagabifif.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/82435336966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=css+transition+delay+multiple+propertiesPDF 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_off0000ce7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7C 17792 bytes
SHA-256: 3a132ba3230fef04a8e96151992deefb435ac9c2ffa5ec0c9f6f00b6157ad325
font_01_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 10796 bytes
SHA-256: ae87f627da9221d081b70822ec712f6f8338e8c48071f51b1a7a4652aa34ecc1