Malicious PDF — malware analysis report

Static analysis result for SHA-256 7952948f896ba054…

MALICIOUS

PDF

86.5 KB Created: 2021-09-12 19:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1de80c1a3544288f7c3407c126c7c96d SHA-1: 5d762907683542a3f761c2af40760bb050866480 SHA-256: 7952948f896ba054d87e82c3ad085686b1d834e5a184b10345b7f01175c6f53f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the ultimate destination. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a sophisticated attempt to distribute malicious content through a network of disposable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://alles-vom-schreiner.de/userfiles/file/66148723353.pdf In PDF document text
    • http://rcp-ranstadt.us/files/zaluwiragelefubofi.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/bidanebukuganolosed.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/2353228292.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2556d0895d2cdeceed5523375f319a69/17505775929.pdfIn PDF document text
    • http://deforma.it/userfiles/files/59435793904.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/jutibumofa.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/xolososugelunuf.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/66193607257.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210911090253006.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/39508244414.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/93855047326.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/41536173636.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/lowoxasaraxal.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161307b9c12f7d---baxerusamezesifibopifamir.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/7662165811.pdfIn PDF document text
    • http://orenprom.com/img/account/file/34726987906.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/4894203919.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/vejuwivatodezusamezun.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/gejimegevusobefunavolo.pdfIn PDF document text
    • http://smogy.ru/files/files/riredubozaw.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/11206335172.pdfIn PDF document text
    • http://baove247.org/upload/files/digalal.pdfIn PDF document text
    • http://ttc-investco.com/img/files/2206957599.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/12330047528.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/55331611696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=sketch+for+androidPDF 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_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 10524 bytes
SHA-256: 3dad016a4e152b4853dcaa54756487742d8b065cf34abb59b4336d82b6ab79e2
font_01_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 18136 bytes
SHA-256: ddc8c598636ef65441e2d8c0bd47070e8d52804e8f0eb0670e94e97e9bfd3f69
font_02_sfnt_off0001349f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1