Malicious PDF — malware analysis report

Static analysis result for SHA-256 78804717b9bf28f5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-15 19:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5aa69cf085758c0b1d73208a3c18038a SHA-1: 3dc4ad6b0ed38e47cffa0cb35ff9ba898779fc85 SHA-256: 78804717b9bf28f5615b80a757dd3f19cc5775afae46d9fe28e777897a10419e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that point to a link farm, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the phishing/malware lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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.
  • 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://liantoong.com/archive/upload/files/jenepinepuvewu.pdf In PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/71896311241.pdfIn PDF document text
    • http://ttc-investco.com/img/files/68816238769.pdfIn PDF document text
    • https://nevisnews.com/userfiles/72376720154.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/jibirakogazovizo.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613023359ae1f---nisabir.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96813461568.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/segajanuraw.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/veraletup.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/kawazumobo.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/74633632214.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/94853338606.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/86862199946.pdfIn PDF document text
    • http://levotst.com/uploads/files/ropisilil.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210905104410_0stx38.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/77617901376.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/6565996430.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/jazarexolejuwenegipa.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/vumomijipivupuvuvali.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/88090283145.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/zoraxazovusagibager.pdfIn PDF document text
    • http://iwort.de/userfiles/file/nawumabugezapigubas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=business+application+development+companyPDF 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_off0000ddb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB3 18528 bytes
SHA-256: 7c55ae860890883c2f096cf2d37ce158ebb4e95f0ad748989c3553c2cdb9289c
font_01_sfnt_off00010df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12608 10908 bytes
SHA-256: f877c34ebb76367d683d73c298e41289ae71fe6ae817202c3ee3476750762798

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