Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d40841303a148e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-13 11:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 853f0a4ce3112041aa96241429868b4e SHA-1: 2690243838e9aa7b2311ed9c34a96319b54af70d SHA-256: d4d40841303a148ee85c8b31497f423bdd7adb97411fa320d3c3e8fa4938e3eb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to disposable domains and are algorithmically generated, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and link patterns are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://philabc.ru/uplcv?utm_term=all+luinor+qr+codes PDF link annotation
    • http://hidramaco.com/files/files/gagasamuvipesug.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/devufuvupojoruxavop.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/54005155167.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/mitelidixezesupelar.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d89e8c3183---ganudojemekokurozugix.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/12828159300.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/dewiwozigesuma.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/69604748510.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/tiluz.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/kefununefitebu.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/jekoxoduk.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wakogalonirefemapi.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/jevipigataguzorapu.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/vugejuperawugisetulag.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/28173037905.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/bavaninixusiwuvovatani.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/vomazijilafifevezatogud.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/71911352034.pdfIn PDF document text
    • http://frchem.cn/upload/files/91749679475.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/gubopareta.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/38ba497c67955102ad259cfa9df263d9/42345382723.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/ravivirefesasafoju.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210903_115721.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_off0000d862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF079 10332 bytes
SHA-256: 154594a797e30c0cdfb7cba661366d99b046288c2fbcfcc848d7f94b01fe95e2
font_02_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 17148 bytes
SHA-256: 499e6b47aff01452d98e7faf9740e840735b2550e11499f7517d328c4c1ddf6e

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