Malicious PDF — malware analysis report

Static analysis result for SHA-256 44dca2881fa99139…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 01:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d29c2d05432266d132419541f114978f SHA-1: 6b258eaab09a7af37e1b637628c02507f22689f2 SHA-256: 44dca2881fa99139c7ad8e8c064a12374485da1a336349d5b47e8e87f9d9d2e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=android+device+manager+other+devices PDF link annotation
    • http://thegoshow.net/userfiles/file/88215833509.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/82170075791.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/sositagokoniziteson.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/15693868838.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/32136839610.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/miwatiromojudifanedonerip.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/kiroxunu.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/bijikapikivoguxorapusem.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091015133073499.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/30207630641.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614241b80abe2---52181654657.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/68243460146.pdfIn PDF document text
    • https://afayl.com/userfiles/file/21262497711.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/115cvboasd840k7h33jg8dbj62/65676463809.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/58988132291.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/rafufivelaw.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/jovarim.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/67804570194.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/dinijiluwelovozamifazetij.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/71118379360.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/zijir.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_off0000be58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66F 10816 bytes
SHA-256: 3757a0b2e4dd5e207a46f28d766b28d769eea26e80a529d048a618364adf0889
font_02_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 16812 bytes
SHA-256: 73d33b6c84ea36b34deb6f93765f39c1bbe0634ec8980e9d335bf66be3feb2ab

Open this report in the interactive analyzer, or submit your own file for analysis.