Malicious PDF — malware analysis report

Static analysis result for SHA-256 be730afdfce021ce…

MALICIOUS

PDF

80.2 KB Created: 2021-09-23 13:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7cec892e6ef1561e7587c65095a800e5 SHA-1: 9977c694e97e57ac0a975fd50194aaca8da0c69c SHA-256: be730afdfce021ceded3b68b47d5ddb734b35df0b9682eeb7d0994be39966790
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially malicious domains, and exhibits characteristics of a link farm designed to redirect users. While no scripts were extracted, the PDF structure and heuristic firings suggest it's used to drive traffic to external sites, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://vrieshorst.nl/images/uploads/file/24506316119.pdf In PDF document text
    • https://autonoleggioassereto.com/file/wurudubekekufuw.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/lefuletenutu.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/97628962857.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/82916201090.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/7531511037.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/5b69d4a0822e755b18b15eb23a7c0c59/muwurofedemutikejize.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/meguta.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/rasijadamu.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/63947164700.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/pedigojemewomuxegumunox.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/38185050121.pdfIn PDF document text
    • https://motecx.com/images/file/65485171682.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/povirokijinabubewab.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48335623081.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/lovufaselategu.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/xuwipotamor.pdfIn PDF document text
    • https://laps.pl/userfiles/file/bazelufetutawez.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/50760203771.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210917010930.pdfIn PDF document text
    • http://abnicum.com/files/file/55964008076.pdfIn PDF document text
    • http://byecook.com/ckupload/files/70853150168.pdfIn PDF document text
    • https://clickbox.ro/images/file/28349456061.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421c8799fbd---6124070936.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+dirty+cowPDF 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_off0000d686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 10036 bytes
SHA-256: bafcb1eb4400bdfc8d6a87feb46860babf2853c02f38c8b018308e2f193685c3
font_02_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 17848 bytes
SHA-256: a1bf089d60ff6774a0a9e28ac5578e7972a81fa6d191be45bf4bd9f691beee5d