Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2319b8a8c19026…

MALICIOUS

PDF

76.0 KB Created: 2021-09-14 15:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9cf2fa9d116b3a49dfe9384fa345971b SHA-1: 3693964d21efeeba331fb4179a88124f6cf76a5b SHA-256: 8c2319b8a8c19026ad93882d7687c7fc42371302a7f4291c37a64a5226ce938e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on potentially disposable domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aznamaste.com/ckfinder/userfiles/files/duriseguxegaji.pdf In PDF document text
    • http://fd-health.com/upload/ckeditor/files/merededamezinal.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/80615990771.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/85537707511.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/lunaluvuzulenovawot.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133befd0f974---bibobedujogopatovul.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/3333366423.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109012102417315.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/sonozovirufebepubus.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/revewebipogidez.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/11400869297.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/4657431270.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210910_113407.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/redetudosukuzu.pdfIn PDF document text
    • https://telenovella-bg.com/files/59917687596.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/bowagixajex.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c95b8375032de9ca745c46c513c554f7/27113650846.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/49361986343.pdfIn PDF document text
    • https://visualarchive.bg/files/71760114087.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210911/files/20210911075243.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/34393524876.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/vesotalapolumowok.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/tirewilinilamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=iptv+stream+player+iosPDF 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_off0000bce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE3 20008 bytes
SHA-256: c95ff0e0a7a89feaf9eb8b9f25ef2490645d0c207e806d93316039290ba5e002
font_01_sfnt_off0000f11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11C 10440 bytes
SHA-256: 738765d90a752190f806e940da566f9bede7404c4f5505a2c166dbf510eadc1c
font_02_sfnt_off000108e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1