Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e7af2bd2220b0b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-23 14:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d44cfd4d4984f1572451ec950a5fac2c SHA-1: 33486ce4985f63d26f94f636eca3c02e16f060d1 SHA-256: c1e7af2bd2220b0bd25a9ed0d38701f40846983cf68fbc6f2bd2e3b2e0de26b6
134 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this being a phishing or malware distribution lure. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kirakuramen.com/uploads/files/sotaxarav.pdf In PDF document text
    • http://jobsmarttampabay.com/files/public/xinalirominivenu.pdfIn PDF document text
    • https://777mto.com/contents/files/zulavaku.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/65113143834.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/rimuroxijiwikolikibe.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/21745337993.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/tigakabupeji.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/wubapewofisejozo.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/ligefurinodovuduzabunavof.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/34182207228.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/69170865311.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/dotesirorure.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/ladazagak.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/26909747551.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/farixefuwiriselep.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/zuzajewugipuli.pdfIn PDF document text
    • https://breedlife.com/upload/files/vunogexobelaxerop.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/19502154283.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/zesasovikopuduzu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/21444484518.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/gilixatigetusizokiketapa.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/76663019122.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/jobarimobanexalixepoxa.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202191855447.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/rawaxular.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/23126085845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+recover+deleted+photos+from+file+manager+in+androidPDF 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_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 11208 bytes
SHA-256: b2d922d7cbee386476f98a142af851e5d15f67d8c95f1f443ae9a0b8283d7cc0
font_02_sfnt_off000115fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FE 17988 bytes
SHA-256: 5260f6b05406010f57a3fc9154a911b94cf699a00cb44742815b0bb371cb17d3