Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24a88eb2d0d3071…

MALICIOUS

PDF

97.0 KB Created: 2021-10-04 16:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9d7a81bcdd5155bdeafadd011c7cb5f6 SHA-1: a56bc49348c4d00e872602decbec223f370710d8 SHA-256: f24a88eb2d0d307115da3e1c81336a26cdae60fc4d346fa742bb3d4254275424
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to link farms, indicating an attempt to redirect users to malicious sites. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, suggests potential for further malicious actions like downloading additional payloads.

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 http://internet-trade.cz/UserFiles/file/45313128153.pdf In PDF document text
    • https://carrieres-pierre.com/userfiles/file/rinifejotukijulokuta.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaa4e8a7cf---94843771065.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/17214986428.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///tigisumodapomam.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/finafivigajumiv.pdfIn PDF document text
    • http://alptw.com/images/files/59955273774.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/35256925150.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/56196992587.pdfIn PDF document text
    • https://pepsima.biz/files/file/51376260471.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/vozejexo.pdfIn PDF document text
    • https://constructor.dilen.top/upload/files/ruvozitizexisugewu.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kipudujek.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/minokiguviladixari.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/22457266268.pdfIn PDF document text
    • http://koddous.com/userfiles/file/66463156930.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/62542635674.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/14211461003.pdfIn PDF document text
    • http://bourgogne.annuaire-regional.com/ckfinder/userfiles/files/48974800625.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/2699377414.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/54212539147.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/6f19400fa966ceef75d836441ad7693a/suxilawesaloke.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/59189394005.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/70437323921.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/seridajudepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=phobia+of+losing+someonePDF 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_off000113e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E5 19552 bytes
SHA-256: 8fdbf248d5114ebe56e84e19fa31ad3a523d5c208687077abf14152d26b9cc00
font_01_sfnt_off0001464f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1464F 10604 bytes
SHA-256: 56c2c0127dbbb010a8e2614bf57d557f2b492399100a19f956e62a3094d7f286
font_02_sfnt_off00015e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1