Malicious PDF — malware analysis report

Static analysis result for SHA-256 1764204dcbc17f72…

MALICIOUS

PDF

74.5 KB Created: 2021-10-04 19:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a4282e5d65662520ec64ee7da661695e SHA-1: b8dd14646582d882a4155dd27df74d9bd7a2a28b SHA-256: 1764204dcbc17f720fafb23739c787aedbed145ff72c13802a8a2dd8aca62a59
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and the presence of external links are consistent with spearphishing attachments used to redirect victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://crewmak.ru/uplcv?utm_term=how+to+create+one+pdf+from+multiple+pdfs PDF link annotation
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/97dff21e2dad5b4a122216555271b1d9/57000381690.pdfIn PDF document text
    • http://agrion.org/upload/fichier/xugivegenikiz.pdfIn PDF document text
    • http://tochalco.com/uploads/files/85818340985.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/fusodadamunivip.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/vedoxosi.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/87652199063.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wafagi.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/10368981645.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/35855222757.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/ligutanet.pdfIn PDF document text
    • http://weingut-suppan.at/files/tuwepibesoli.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/83245131773.pdfIn PDF document text
    • http://pilatesmystyle.com/userfiles/files/padamojotukavuvaned.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/jaxesugewevodowebu.pdfIn PDF document text
    • https://indreninepal.org/userfiles/file/pajutatiworijibifoxuzu.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/5603603737.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/xetibaperajuzixugarudu.pdfIn PDF document text
    • http://wingtsunkungfu.ro/imagini_ws/26158121362.pdfIn PDF document text
    • https://greenlakecruises.com/ckfinder/userfiles/files/bavajododurifudiguku.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/kobazabudusigoga.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_off0000c0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0A4 10956 bytes
SHA-256: ba42f86a6f15eda5ad953a6c5d1ba156f9f567c771b6fb5091ee0757da096875
font_01_sfnt_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 16684 bytes
SHA-256: 2b9323562b8a8ed9b1334a3895b4ebba70c14243416a8f56d91bddd72ef96128