Malicious PDF — malware analysis report

Static analysis result for SHA-256 acccf0b750afa668…

MALICIOUS

PDF

72.9 KB Created: 2021-09-15 12:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5742867a2113d09ff43970db52211622 SHA-1: 3dc80cafc635ac259b4a64bbeb31c3f074a7218d SHA-256: acccf0b750afa668f4fa883beb51d93cc91e95b7ea496ea9c1f8bd0260410e10
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF that contains multiple embedded URIs, including one pointing to a raw IP address and others to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous links to PDFs on various domains suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://shen-su.eu/gfx/userfiles/files/18905774550.pdf In PDF document text
    • https://hagakure.by/upload/editor/files/bisixitebome.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/37256042150.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/fivune.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/vukofenaxitanizi.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/87129173452.pdfIn PDF document text
    • https://kultmotor.hu/images/files/78674021421.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c266e0c69b8cf700b0e9bd11e52d0b5f/39181978170.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/a2g00g3c7esa6h5l1aseevcgl1/55643188005.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/7828544759.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/vodewarotaximefaji.pdfIn PDF document text
    • http://fabtur.ru/upload/files/kozutexamerotajifageruke.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/zevudonal.pdfIn PDF document text
    • https://ksboutlet.com/file/files/96806527477.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/fasifatosololut.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/96773449680.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/buvaxovudobu.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/vofiwubukolosexaki.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/60718692670.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/vavovakeduwajuvizopexivuz.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/wobig.pdfPDF link annotation
    • https://imotrading.com/images/userfiles/revawolib.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/disadumuberidowuvetonenos.pdfIn PDF document text
    • http://martonelektro.hu/files/file/bafalew.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/rawekokuw.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/22522115306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=among+us+airship+map+download+apk+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_off0000bb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2E 16076 bytes
SHA-256: c6c535de6c261053f1c082ae27f1b0eb2afb5272f2e1df899d41ee067e4d2e03
font_01_sfnt_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA9 10868 bytes
SHA-256: cb127ac100cc44a61ea14fc98e6a452b67d5ba3cd270a07f251a9e0dc98c9727