Malicious PDF — malware analysis report

Static analysis result for SHA-256 869b843180cad968…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 12:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: de1c95bbbff04ffada782a3713c06ed5 SHA-1: f9c37cef806d184ead730e6db49bbf4860cbc9ec SHA-256: 869b843180cad9682e2b27fcd4b48b3787dbbb61386bcc6553d425dc463349b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, suggesting a phishing or spamming operation. While no scripts were explicitly extracted, the ML_NYX_PDF_MALICIOUS score and the nature of the URLs strongly suggest malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://xetnghiemadndanang.com/upload/userfiles/files/gexonosimuresoxedex.pdf In PDF document text
    • http://tpokebar.com/uploads/files/16692131552.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/21063221622.pdfIn PDF document text
    • http://techbis.pl/files/file/11843345654.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210912060103.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/tizowivoxalumotixoburise.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/6850745272.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/64723685242.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/sixokuju.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/63384620034.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/sifanena.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/78737950644.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/vujopabojona.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f986237cad9c40dcabb021a53d5e413a/91550568334.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/66516479349.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/77476951220.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/68729902579.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/12491639208.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/75199148551.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/feac9014b303867eedb2827b79a0b044/23117038502.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/zudemeperubilaworugipajuw.pdfIn PDF document text
    • http://consade.com/userfiles/file/vixojanevili.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/97432171197.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/69235348729.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/nonukepozazeruvekevunese.pdfIn PDF document text
    • http://lgassociates.in/uploads/61863155110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=printable+a4+graph+paper+pdf+1+mmPDF 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_off0000b15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15F 10928 bytes
SHA-256: 2674a75b2ed943ef3563a7c8086f8bbb5d4d110691015364f84e5be178f33d9e
font_01_sfnt_off0000ca13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA13 16312 bytes
SHA-256: 5152fe6b0568b705601211078788c7f17230b72a4a6fe4d0d0f900ea170b728e
font_02_sfnt_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1