Malicious PDF — malware analysis report

Static analysis result for SHA-256 d622944281d0860a…

MALICIOUS

PDF

76.3 KB Created: 2021-09-09 13:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e080d1ccfb6d001aa3c2a0dc7954f04c SHA-1: 05232225364bc55dff8d448d6ec91a6254c9e8dc SHA-256: d622944281d0860a0c4d3f50c668e05edb83aa20f433ad9d64b35987c7ae93f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and forming a link farm, suggests a phishing or malware distribution campaign. The document's structure and the nature of the URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dges.in/userfiles/file/kupunebizajar.pdf In PDF document text
    • http://techbis.pl/files/file/ranude.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/3802889239.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/43192205428.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/16527901172.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/nawawulexanoduxib.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/74117889777.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/50492447081.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/81173055608.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/puxagejipanori.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/228523390.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/pizeja.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/16093559729.pdfIn PDF document text
    • http://chemicalengineers.ie/images/65929475576.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135812f1578f---nafedajidelufota.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/molusujalesipejaninixud.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/11326877090.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/72182399629.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/26552973734.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109070801581344.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8fe1e440---munogegisox.pdfIn PDF document text
    • http://www.depomatrial.com/file/41451538904.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/51945443993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=kamen+rider+ooo+belt+apkPDF 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_off0000c3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C4 10608 bytes
SHA-256: 4f86744bee4a5035da010382a512afea411db29cf9c23d40f36f2f8fc7e0a795
font_01_sfnt_off0000dba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA8 18224 bytes
SHA-256: 98121899654dea48299030d800a0b0a78398f017ecd22d71bf504393407893b8
font_02_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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