Malicious PDF — malware analysis report

Static analysis result for SHA-256 d546a22f34d76c06…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 01:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4809e1ec5e025e4247745a0a56855934 SHA-1: d558a3e0fbbfd13357bc7c73831d2fd04e344fab SHA-256: d546a22f34d76c0680e007bf08823c639cb308619c57e40533951132aa21325e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious, indicating a high probability of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests it's designed to host many links on disposable domains. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hoakhanh.vn/uploads/image/files/23703576912.pdf In PDF document text
    • http://husplaza.hu/editor_up/bafojupuvu.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/1426630110.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/vanofawuji.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/15bulj3oocdkpnti4knpf442r3/49055721432.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/65273360395.pdfIn PDF document text
    • https://megashina24.ru/files/files/potejitatomobejebozebiz.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/juxegafopevilujatupuxi.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/19942428688.pdfIn PDF document text
    • http://ciskmv.com/css/file/mumigotadinotizijebarero.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614660bba217d---zomebunekepeta.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210903000239_24520735.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/56216245902.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/41612664140.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/nozumiboteriweponidireked.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/joduxuvogeridatixijoxuvot.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/97870733885.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/38391030392.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/fugakilikelisi.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210904225541.pdfIn PDF document text
    • http://www.og2c.com/images/file/kudinazikobakiw.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/buzezoretudepumarad.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/42380919849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+secret+calculator+appPDF 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_off0000e7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 10588 bytes
SHA-256: 3b58ee6718c20da785323bbd7c73b10f5379cccad705989db45e73e3e5dfb567
font_01_sfnt_off0001002b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 18056 bytes
SHA-256: 684e7cd9946ea5885d96bacd82dab1307c7f4370b3dea4ce1824916840abdb93

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