Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b00cd935c906cc…

MALICIOUS

PDF

74.2 KB Created: 2021-03-28 16:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 130c918785620903410e2071b5d0b5e0 SHA-1: 46d21dad77c3f6a39f30e3908616e48794c3bd15 SHA-256: 67b00cd935c906cc0adac7c94c37a658268c4ec551cc8e4cdcc43579a9ed1539
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on Weebly subdomains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=dunkin+donuts+butternut+munchkin+recipe
    • https://zunarorukozem.weebly.com/uploads/1/3/4/0/134016655/3209730.pdf
    • https://nesefutuderixu.weebly.com/uploads/1/3/2/7/132740375/6a83f.pdf
    • http://trynutra.shop/all_future_tenses_exercises_with_answers0a4dz.pdf
    • http://callup.today/1453037293h4obz.pdf
    • https://natufebopod.weebly.com/uploads/1/3/4/3/134305275/2395416.pdf
    • http://tehnikator.ru/todukefugogijaakpsw.pdf
    • https://wugowimuvup.weebly.com/uploads/1/3/4/7/134762233/zidorawukusun_fajevenaro_guwoma_xuvon.pdf
    • http://help-copyrightviolationhelpcenter.com/how_many_episodes_in_the_mini_series_defending_jacobwl4lv.pdf
    • https://novatoful.weebly.com/uploads/1/3/0/9/130969934/xurupasa.pdf
    • https://siganagimub.weebly.com/uploads/1/3/2/6/132683357/wisojasikotuluj_mokurewakefili_pazegixasori.pdf
    • http://lnstagram-copyright-confirms.com/plantronics_backbeat_pro_3.5mm_audio_cabledgr1o.pdf
    • https://wuwiragirek.weebly.com/uploads/1/3/0/8/130874366/kibalefomijo-pozovetugogigef-novegebevom.pdf
    • http://all-gopro.com/10._snf_matematik_ders_kitab92anq.pdf
    • https://wojodusu.weebly.com/uploads/1/3/2/8/132815854/zuviza_zuxuzipupa_nulewubafubumur_ludun.pdf
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/243e07e9cc3a938.pdf
    • https://zunezazawegor.weebly.com/uploads/1/3/4/6/134665047/8957670.pdf
    • http://ig-copyrightviolation.com/samsung_chromebook_xe303c12-a01_specs246zf.pdf
    • https://mojabizozawobe.weebly.com/uploads/1/3/4/6/134699592/d9bf9590c701.pdf
    • http://my-favshoph.online/barycentre_trianglew7clo.pdf
    • https://jotowaviroretog.weebly.com/uploads/1/3/4/6/134604658/rarepovoxiw.pdf
    • https://rizaxobekame.weebly.com/uploads/1/3/4/6/134698747/jijaki_liraxuzulexefed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e35c.bin
4dc803d9a6d5fe5b0ea45e3064eab2d83cb6b9d98543958f4cd065215201f104		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 5272 bytes
font_01_sfnt_off0000f525.bin
9aea379fdd424ba417badba219f4259f3d51ac6261897cdc2ef26f4b441f3ce4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 11444 bytes

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