Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e86ee19778a0f8f…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 04:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ceb124461fd30af58c6c79c78204778d SHA-1: 0011f05db86d65ee4aab5333ad2aae9c86a9a8cd SHA-256: 7e86ee19778a0f8f8abd463611bf4744630a069ca9bc4cb6becd02ced2d76726
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://irlanc.ru/uplcv?utm_term=iphone+xr+bangladesh PDF link annotation
    • http://hnsunnyfood.com/d/files/netigekox.pdfIn PDF document text
    • http://iknow.pl/files/file/48810849654.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1612f316e0681b---51056806805.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/11221816667.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/mujibibonugos.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/37295633615.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/daladobepowutavixotasal.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/mexane.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/patazi.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/jupuvuxikipajoresak.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130a24685ae9---64738811572.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/refutetawojejiwilolum.pdfIn PDF document text
    • http://school15-tyumen.ru/f/razoliboradufexogulo.pdfIn PDF document text
    • https://gangnampools.com/contents/files/10799699365.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/49884445024.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/93735826135.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/13836928099.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/zezenefokipipokixupe.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/xatarebobido.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/konezaputez.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/13850725010.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/11881471097.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/dimebibunaramonez.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210914_042838.pdfIn PDF document text
    • 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_off0000d906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 17672 bytes
SHA-256: 5fbf5210fb355c765de95f17149c5ea0fd1c4302075c3f68e1511b08f6650d80
font_01_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 10676 bytes
SHA-256: 53013d9cd6ee350987efeee5a29e4dc32c3340ee7563bfef99c079cd5a192c6c