Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4e48a070773ed3…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 15:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 392b556b49f4d747703ef47ddbc61cd7 SHA-1: f65386ca5817d24da441dc5de5b3dd0c5559272e SHA-256: 5c4e48a070773ed3114dca42fe278930b8e2b6818e4379041be33219871c5fc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm with numerous external URIs, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and the presence of many external links point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://everintelconsulting.com/upload/file/202109180054025945.pdf In PDF document text
    • https://millersexpress.com/userfiles/file/zemafo.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/jowaz.pdfIn PDF document text
    • http://carbontuning.ru/file/soxulipudatotadabagoj.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/58465365329.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f99629ac1b---21087723369.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/luxigopimaxekoweta.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/jonedubop.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/64432570485.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2db8e041f1050afe00af7458b7d40d90/87650039176.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/56608186556.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/gatumil.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/32400734620.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/32656047559.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/6566449019.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/90410675719.pdfIn PDF document text
    • https://flomogroup.com/upload/files/jojakegogamerozisuw.pdfIn PDF document text
    • http://levotst.com/uploads/files/42193529656.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/firikodubune.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/15018284036.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/bulovovodudirisegamu.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/13584952915.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/42182715498.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=isaimini+2019+movies+tamilPDF 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_off0000c06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87F 17128 bytes
SHA-256: c975edc1d4dd20ac19494ccf6cea56439ec214666673fda5e9a32ae073abe63a
font_02_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 10648 bytes
SHA-256: 3b0989e63c74b078e618ea900df92474f2c08d91cc882ce95f91e8b2792bb9a6