Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f7e4461ef9c0dd…

MALICIOUS

PDF

79.3 KB Created: 2021-09-16 04:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4cf78c0118310a3d3fd9e51a55a97818 SHA-1: 5fb54f3e5bb91e565e5fdc4885c3ad2c152de7e4 SHA-256: e0f7e4461ef9c0dd94c3b366af6e44d52f1a62336d04d3a7cdb3d2509795fced
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs, including one that appears to be a link farm on disposable hosting. The PDF structure and embedded content suggest it is intended to redirect users to potentially malicious websites, aligning with phishing or malware distribution tactics. No scripts were extracted, but the presence of external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://synerhu.ru/uplcv?utm_term=less+memory+games+for+android PDF link annotation
    • https://pomacanthe-art.fr/imagebeforeafter/files/ratubawizu.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/14014343569.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/jarugaxubotuxofi.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210905005558.pdfIn PDF document text
    • http://hanifeugur.com/image/files/5299842542.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/62947849060.pdfIn PDF document text
    • http://philboyd.com/zunusexufolu.pdfIn PDF document text
    • http://profstil.az/userfiles/file/xekibajoval.pdfIn PDF document text
    • http://paradoxine.com/upload/files/nobifomab.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb273410c7---falekibajuzuriwinageket.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/rupufazotadufawonesijali.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/ruzodajasenid.pdfIn PDF document text
    • http://simonide.org/userfiles/file/35969432015.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/foxalupusik.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/xetixibaxukatopivi.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/68820088093.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/mikod.pdfIn PDF document text
    • http://fructusartis.com/i/File/fiwibedigozekuxuk.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/p64utvct2j3jhrr0o1ivtsbnod/kevodovarawibufasewos.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/nerogimevuridi.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/33827050784.pdfIn PDF document text
    • http://airsoft1.ro/files/file/jitukarimaduwidulaziwax.pdfIn PDF document text
    • http://julianina.dk/upload/file/movekedemisojuwutavupar.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/suxutonefubobufowi.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_off0000d40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 10624 bytes
SHA-256: e97e3c7b382281064f852f42059b1466b9cccc537dc3463b964d781ed97989f7
font_02_sfnt_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 16980 bytes
SHA-256: 40c82927aeb6a20abcf6d6e4f61dc64e932a7bb50ef04416a5679a1c54027965

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