Malicious PDF — malware analysis report

Static analysis result for SHA-256 893b7ca7ce570d64…

MALICIOUS

PDF

73.8 KB Created: 2021-09-11 22:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5bcc18fc46e312c1508e270aa5cf9b10 SHA-1: ca7ae34bf05da83b7aefef17e8056e5faba37191 SHA-256: 893b7ca7ce570d64f5e6f3ce7b3554538ea44c5a55e1c7ddc3f256409f84e392
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to unknown or potentially malicious domains, suggests a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the use of disposable hosting and redirector URLs, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gestaocipa.com/public_html/Imagens/file/tafiserejijezapifufoj.pdf In PDF document text
    • http://tapestry.cz/images/file/files/vomajopuvufezefasetenisa.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/57204077490.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/jibol.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/94303031393.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/xofijuxam.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/lasijivov.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/remuroganulijavemodom.pdfIn PDF document text
    • http://topflexsports.com/uploads/38347275752.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/19109227814.pdfIn PDF document text
    • http://koutingchina.com/upload/files/74614540196.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/dibupoxumelomolejomum.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/ruzojubavirapolonosaroset.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/xasigeditaraxujedagitenev.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132321406f5f---rivalow.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/33298061866.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/xowarosevajotimisa.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/14725359763.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/newupemegolitikusugozu.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210902220242.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/89267720527.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/zazugubogejugonuterela.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/mitajeg.pdfIn PDF document text
    • http://espicycooking.com/files/file///lefip.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/nupixod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=x+survive+mod+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_off0000ba08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA08 10568 bytes
SHA-256: 407ad5254865358529dfd2b60e804876074b3c8babd755328be9c2329d920c20
font_01_sfnt_off0000d227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD227 18444 bytes
SHA-256: 62513d5f1546a88b816113a520e4c63cd6329872b3ca3f62d78f7958a45aa06e
font_02_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1