Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb34a3a089848622…

MALICIOUS

PDF

68.1 KB Created: 2021-02-14 17:19:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 35a5f6d3de54f6de9c5bf50828632d3b SHA-1: 417bd6c197ecae2706a8aea7e878495a3e3814bd SHA-256: cb34a3a089848622e88d3c28a3981af639d64ef056889dd9338cd51b1519bea8
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous embedded URLs, many pointing to disposable domains or link farms, suggesting an attempt to redirect users to malicious content. The presence of a 'utm_term' parameter in one of the URLs indicates a potential tracking mechanism for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/aws?utm_term=atkins+quimica+inorganica+pdf+espa%25C3%25B1ol PDF link annotation
    • http://axacheat4.xyz/all_chemistry_formulas_for_jee_mainigjzm.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/RwWzicl/women_s_light_up_shoes_for_adults.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384307/normal_5fcef5d68bfa7.pdfIn PDF document text
    • https://dipofivebizog.weebly.com/uploads/1/3/2/7/132712563/xutugebo.pdfIn PDF document text
    • https://salupoxegiras.weebly.com/uploads/1/3/5/9/135961269/fe0ae6c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483388/normal_5ff0c1381b196.pdfIn PDF document text
    • https://fitijozis.weebly.com/uploads/1/3/4/3/134372299/faromujegase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5fc5b5fe9284b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386073/normal_5ff221bc11c42.pdfIn PDF document text
    • http://requiremcgood.com/supulipalagoa2r6c.pdfIn PDF document text
    • https://redodire.weebly.com/uploads/1/3/1/4/131408340/wopimaponuba-makamu-bafutuxanup-nafufegode.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/vavale/marathi_koligeet_banjo_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/59098222835.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/bhojpuri_movie_video_song_3gp.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/speaker_jbl_charge_3_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/54883462164.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/vevakerivonujax.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_off0000c9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E4 5864 bytes
SHA-256: 35b22941d0500a403803c9d7a93ae88de7238401e830486f32e488f5a58357c9
font_01_sfnt_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 10420 bytes
SHA-256: aaedc21cebc88c378a512e8cba24aacb7b3c0424da4bdba399549a706932b555

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