Malicious PDF — malware analysis report

Static analysis result for SHA-256 a056d97fe64172e5…

MALICIOUS

PDF

90.8 KB Created: 2021-09-19 14:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee04ddf3492c34ee487c14231f35c566 SHA-1: 23961ef2c820f32a01b18f9917e90b3244e57369 SHA-256: a056d97fe64172e5d85562935e54883acc10cf046c646bf68593018cd756e665
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of numerous embedded URLs, many pointing to disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely leading to the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://fjzy18.com/image/uload/files/mapuxakoxirefukososedigag.pdf In PDF document text
    • https://paradigma.bg/uf/file/9201163243.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/rulajebedofijozesoj.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e8dfba606bd038c348b8a143be189f77/34991509716.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/11471744389.pdfIn PDF document text
    • http://abnicum.ru/files/file/75587364506.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/781876726.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/11511731178.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/mojopimejeza.pdfIn PDF document text
    • http://zgic.ru/!upload/files/77571142577.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/zaxolexuxofala.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/mikidupi.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/wekikezerot.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/17685559717.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/topibesavarofesudigipetig.pdfIn PDF document text
    • http://gapp.fr/medias/files/tiriferasowab.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/rifuxo.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/kezizipetusaxasonad.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/tizufutowelerefuwaje.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/sakuronemasav.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/40001805046.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/45476912883.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/59634121053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=funny+words+that+start+with+bPDF 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_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 18632 bytes
SHA-256: d2d10c8c4286011ec0c1d35574862e1a45f073788ae1262cb910006ac61cec2d
font_01_sfnt_off00012d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14530 10584 bytes
SHA-256: bc94d73a12b570cf1dcccf9386f92b49552439eeaba831bcb749078f907e96a9