Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b1e4f5dc6a9d59…

MALICIOUS

PDF

80.5 KB Created: 2021-04-16 07:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 21b6ddc109b5f2d55a0b6a83d373534a SHA-1: ebb18fda9effb1d161da9e1b9a1f90c2a3d94ee0 SHA-256: d7b1e4f5dc6a9d59f17b647f3332642e81a79440168ce4b9d7d6bcc46d198a51
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, indicative of a link farm or SEO spam campaign. The ML classifier and ClamAV heuristic strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics point towards the exploitation of PDF vulnerabilities or the use of embedded JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://maypoin.ru/strik?utm_term=how+to+plant+different+trees+in+forest+app PDF link annotation
    • http://all-gopro.com/446619688581npm9.pdfIn PDF document text
    • http://ourfanz.com/uber_driver_requirements_georgiadxj3i.pdfIn PDF document text
    • https://vumenaxusavow.weebly.com/uploads/1/3/4/6/134600171/127f96d166.pdfIn PDF document text
    • https://bekonerotukabi.weebly.com/uploads/1/3/4/3/134366377/992ddcb7b.pdfIn PDF document text
    • https://dovavifedudefew.weebly.com/uploads/1/3/2/7/132710721/revekikojogufer_voxuzugulop_dijiwimimagigo_sulesotowid.pdfIn PDF document text
    • https://rurevudo.weebly.com/uploads/1/3/4/2/134265418/d04dd14b640f7.pdfIn PDF document text
    • https://wovenatoz.weebly.com/uploads/1/3/1/4/131454427/72c4236e.pdfIn PDF document text
    • http://cz-nitrof.website/538193429158ty9m.pdfIn PDF document text
    • https://kodopexo.weebly.com/uploads/1/3/4/6/134693050/3117071.pdfIn PDF document text
    • https://noremovex.weebly.com/uploads/1/3/4/8/134883944/mabawutatu-pafozuditi-gaweximefasug-xujadatepiwiw.pdfIn PDF document text
    • https://kelogukagikuval.weebly.com/uploads/1/3/0/7/130739039/fcfc9f207.pdfIn PDF document text
    • https://sikufotoxatufik.weebly.com/uploads/1/3/4/4/134458503/999bb1d082d8cdc.pdfIn PDF document text
    • https://xubivotalo.weebly.com/uploads/1/3/0/7/130775972/gibotapajuvubof_kegaxugedapiji_mumibosefip_rurizarawa.pdfIn PDF document text
    • http://detonic-official.website/mofumakamiga2xbn1.pdfIn PDF document text
    • https://xemivigezeb.weebly.com/uploads/1/3/4/4/134481563/77a2b848c8522e9.pdfIn PDF document text
    • https://gamajebijapam.weebly.com/uploads/1/3/1/8/131856653/a31085.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/kexeru.pdfIn PDF document text
    • http://fadakivok.rf.gd/naxesijawasefalasavevig.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/phonics_worksheets_2nd_grade.pdfIn PDF document text
    • http://xubudexev.epizy.com/bamesosemurusip.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/sozazejipudusutaje.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/chrome_extension_online_video_er.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/attitude_shayari_dp_for_girl.pdfIn PDF document text
    • http://sonatufekofefab.rf.gd/selosozovodovitesududi.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC2 5088 bytes
SHA-256: 6f529501737be5f6c7ff7aca74cb5357f8354d36569b5845128cce8ecc6bc0e8
font_01_sfnt_off00010d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D32 10880 bytes
SHA-256: 7317f37ac286c63eb75bfee4118d71e84de1da8eea817da64e5baf9668670e06