Malicious PDF — malware analysis report

Static analysis result for SHA-256 2701f987d67ffc77…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 11:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c1a2e8722b0fae92c7b4d7df0869be5 SHA-1: c94832a1afc5dbfc69ea7e0f807ddb864fa777e2 SHA-256: 2701f987d67ffc77de0ca9e213421e9221a0c4e2372ba3b0cb838a0c9f9bc06d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous embedded URLs, including one pointing to `synerhu.ru`, suggest a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF acts as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://synerhu.ru/uplcv?utm_term=the+walking+dead+survivors+mod+menu PDF link annotation
    • http://fine-cottage.ru/userfiles/file/17055290443.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/97870958389.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/20416043270.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/df2893ad3d29e3cb55c864aa870d8bd7/vujajixerafivujewibut.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/11020543801.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/67062097248.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/60932132708.pdfIn PDF document text
    • http://telektrans.hu/editor_up/rixifofuvodulakudota.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/16895411417.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/32192729094.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614f389a37bab---5593422980.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/redetifipaze.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/tibip.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/46217376461.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/fiviwe.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/lagitajamitedevajosa.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/rexexelotomorugam.pdfIn PDF document text
    • https://kimcert.net/E/file/74120759663.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210910230438_1317672654.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/taloxesivurenum.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/17409757620.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/20062127769.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/32716924092.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/pekudeju.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_off0000b20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20B 16168 bytes
SHA-256: 734780cb5747ab1c57cf967570c7f14af1eb1b9fdb43a1cc815b5b9f2e96d8bc
font_01_sfnt_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 10904 bytes
SHA-256: 35f004767818724fbe9ee7384d446a571aafffdb83a45f6c59ffb4c9c6821b57

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