Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70c706bbcfac4ea…

MALICIOUS

PDF

69.4 KB Created: 2021-09-30 17:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d0ae9b30f9ec73f7e935a47e1a0fe937 SHA-1: 8f5b6673685cb3ac7a2652a3876251bdd62a48cd SHA-256: b70c706bbcfac4ea57f135c7dc641f3544e258c48d16eed7d68af992bcd0d0f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant number pointing to unknown or potentially malicious domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bangtutrang.com/upload/files/novevaxugiromagososanum.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/5e810382dd071e96a84fa900d65fbf4e/54269047751.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614825bbbcfa3---deforikod.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/rozem.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///tekepowapevot.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210918_232405.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/woluziranejanedodax.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/19577418306.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/82347889478.pdfIn PDF document text
    • https://mk-pamyat.kz/uploads/files/zanegoxanabaluza.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/51712717835.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/surogoregewarexafisubej.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/kefamerorasapup.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/28885970562.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/sizapipipoxag.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/77991934961.pdfIn PDF document text
    • http://packturf.fr/files/xasifotaxamalugetenoniti.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/45228273229.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/85050377040.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/69364372371.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/fokobalexelagogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=programmable+read+only+memory+pptPDF 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_off0000ae08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE08 10732 bytes
SHA-256: 673f38f399e379bd24c35eccc3121851235024ab3cd6eeab9dbd77cfd847a4e0
font_01_sfnt_off0000c648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 15736 bytes
SHA-256: f47f2f16cf95096bee528fe12c26ebe3a297569bbbd4e1a9b60a0938c1b013c4