Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a0d0bf6e30dc76…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 10:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9756a437c96831314ee8ceda69652225 SHA-1: 1048fa0802b0c5f0f0473e56103cadc55192d2d4 SHA-256: 91a0d0bf6e30dc762778d26b009605807f445db734dc891732ee553118a159ce
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, likely to redirect users to malicious sites or phishing pages. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://garglob.ru/uplcv?utm_term=iphone+x+pd+charging PDF link annotation
    • http://emke.hu/uploads/ckfinder/userfiles/files/39805994204.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/bisikajujubuzubiwivoxe.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/295b3bf2244dcd0e05ffbaf446b9d01d/jiligij.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/pufinibakizolaxofujapoku.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/5443851501.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/55113793272.pdfIn PDF document text
    • https://jjpremiers.com/files/78744271702.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/97755798126.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/betedafura.pdfIn PDF document text
    • http://horvathortho.hu/tmp/63114414790.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/24198309523.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f4e3261bc8954e83fda29d1ffd713bba/49137578963.pdfIn PDF document text
    • http://xfswchem.com/upload/files/jatofoxijemuludanep.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/rafujesazawesiruxedige.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/xalejadaxidolu.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/84051490595.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/pogisaxe.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/60207087207.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210901105412.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/mupoligomagupasujap.pdfIn PDF document text
    • http://cpils.com/userfiles/file/kerideritawuwejozil.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/2950586209.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/33939503411.pdfIn PDF document text
    • http://erex.hu/upload/file/89930255617.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDD 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7
font_01_sfnt_off0000d524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD524 21904 bytes
SHA-256: 087e215e7673c6ff663e55dc4ced2a82021aa4d8023474993fa46a0e9d0415cb
font_02_sfnt_off00010b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12378 10532 bytes
SHA-256: 13e607958672eadafc53298614faf24e94f8ddccec80ca70940c52eecfe62072