Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88cb6519be7bc6d…

MALICIOUS

PDF

75.3 KB Created: 2021-09-26 06:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aefcf006fe5aac0d126998b2366e7813 SHA-1: b268d7b527fae147f0980527c99dc5e9a04bf8de SHA-256: f88cb6519be7bc6d5ace5dfc77b96868aea7e74cd2ffd87465919bc7527371b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one prominent URL pointing to a site that appears to be a link farm or redirector. ClamAV and ML classifiers have identified this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and the link farm heuristic strongly suggest an intent to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://pixomot.ru/uplcv?utm_term=percy+jackson+book+2+free PDF link annotation
    • http://progettocecinacuore.it/writable/public/userfiles/file/gosibosivuraz.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/845108378.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109021301349327.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/86703092471.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/67734812407.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/71038634312.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/pepubelapoxewev.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/17744158581.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/ravugesi.pdfIn PDF document text
    • https://eguiders.com/uploads/38136968567.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/zibazazakakezidozet.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/33063182638.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/30315818494.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/52581279597.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/1912146911.pdfIn PDF document text
    • http://saktigroup.in/uploads/18120982778.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/24129367580.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/70116532166.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/10720733558.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/59922059130.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8f692e86---gerufexijoduluze.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/xarawedumikiw.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/vumodoburag.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/79303990542.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/67081254663.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_off0000bd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD45 10692 bytes
SHA-256: d73df402bf0108d1d1baba8729586092151cc31b0a2c1892241443a691da664f
font_01_sfnt_off0000d60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 19476 bytes
SHA-256: 4c8fb287e5472a8520acc0c25318dbd892e76c8e8bd167d3460bdf4e3fc9cdb2