Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6255f68a63694c5…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 07:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17cbce9682457c3426e11f8de44e4461 SHA-1: 414ec25e87b8719c1fd0f0d64efa6ad78c1ffd30 SHA-256: b6255f68a63694c580e519fa4bd391adcf35938a1146df18f1e947c980408f65
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://coretry.ru/uplcv?utm_term=ld+player+software PDF link annotation
    • https://a-guskov.ru/uploads/files/71802435996.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/17722309000.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/46361210189.pdfIn PDF document text
    • http://kleiberit.ru/files/file/regafewedolaxenepefuti.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/29418818322.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/81128662928.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/kosuvupusizufa.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161385a7354b0d---xisiwajogogakebegav.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/tuwenanumasagi.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/27619426984.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/27431880807.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/165v7m3etr2k38pldr13iu9ns5/vexewegixatevosipitin.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/80808803175.pdfIn PDF document text
    • http://farmina.ru/uploads/files/4714898998.pdfIn PDF document text
    • https://korankertas.com/contents/files/tedegun.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/xovosanuri.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/36643251124.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/84823551196.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/48816055927.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/70640624939.pdfPDF link annotation
    • https://hoya.hr/UserFiles/file/1825480554.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/14513595324.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/gebososo.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/widajuzaziwebubisabe.pdfIn PDF document text
    • http://land89.com/ckupload/files/36694953891.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/robefifiselaj.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_off0000e042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE042 10452 bytes
SHA-256: 42dc889075c009bacc767d26cd0f43dc74b80361eea2dde07a616f701668bb49
font_01_sfnt_off0000f839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF839 18012 bytes
SHA-256: 3c8c178d074223ab4338f67d5681541c0b91835085119518d2f2a23e60e7722a
font_02_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1