Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c78de141910c4f4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-17 14:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d285837c8de75d08b89648f859f1f685 SHA-1: 4208bee47a642ae3f36ea4641c1beef821c81a5c SHA-256: 7c78de141910c4f402924a5b861b5eb174a9dd5e5e1d7e0e40879222a9a28053
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The file contains a large number of embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool, rather than user-readable 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 https://synerhu.ru/uplcv?utm_term=sfr+tv+tablette+android PDF link annotation
    • https://cobaltinc.org/userfiles/file/zazabaloxiro.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/sarefatitejewebowevige.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/zudifezunopib.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/kapaka.pdfIn PDF document text
    • https://csn-alliance.com/data/files/6293821627.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/tabananedofilazobewarax.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/95713108219.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/85353907148.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/58586067467.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614402f689442---begopanek.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/18151745078.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/peluxe.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/39036681504.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/4589231764.pdfIn PDF document text
    • http://beta-rc.com/upload/files/gavanoxapubit.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/53859736278.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/59322759944.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/jezob.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/wusegawezeb.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/58250876598.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109011710322253.pdfIn PDF document text
    • http://schokofontaenen.de/idata/zulux.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_off0000da9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9E 10460 bytes
SHA-256: 7101a13d0b8a933d0589e1636424a7c8267e9bfdad4404b23dee6ee73a93d320
font_01_sfnt_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 20412 bytes
SHA-256: f6ca98538a1194d9819093df3f697ca436a3f6e1d676a9c66d296de4dad85aa0

Open this report in the interactive analyzer, or submit your own file for analysis.