Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f61daa4f9993ea9…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 19:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e803351ef0ace8afa62e58a9c5cfc8f0 SHA-1: 375e83ecad97335361f14caf5f753ca7f9b030f4 SHA-256: 0f61daa4f9993ea94e119c44bfe38afeddcd333f93367917252878c967d2e494
134 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, with high confidence. It contains numerous external URIs, many of which point to disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the intent to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gedayapi.com/userfiles/file/15178248397.pdf In PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-16/20210916185826575042.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/gosipakadu.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/pelakipuwejiraxozajujuzi.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/pufumofonurekagofevezufef.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/39707940735.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/8881019263.pdfIn PDF document text
    • http://lagrupacio.cat/file/jafupaxulelukewerotita.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/dolimugi.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/87770743176.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/jutujekepido.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423f3e30b4e---20947336860.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/83847061809.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/09531598029e9fe997222dfbd7ef3d4f/69852618636.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/gisap.pdfIn PDF document text
    • http://kustari.net/userfiles/file/84272910518.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210909122254.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210905081114.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210901163520_306024895.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/85227763624.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210910095314032.pdfIn PDF document text
    • http://usateatop.com/_upload/files/17970987517.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/55707423541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=crazy+cooking+chef+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_off0000d690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD690 17440 bytes
SHA-256: 5d035f07337ba723e1b41758c0861a0462143c96f97f69a77f2057ad749982c8
font_01_sfnt_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 11052 bytes
SHA-256: 429d503e7634753bb6bebfb3298a4ce846be8411a4ad842b8b4118a32c2ca282
font_02_sfnt_off00011d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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