Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdcd647a3d3a67d…

MALICIOUS

PDF

75.5 KB Created: 2021-03-20 04:44:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bdbbb423433c13e80aa38364e95716e9 SHA-1: c4103eb943c7c47a4e0f144deee33cb32e09a064 SHA-256: bcdcd647a3d3a67dc6680dad29696f2aa46d4b16094e94c9f8d89e4c8ec45d3b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains text related to 'contact us template' and authoring application details, which are likely decoys.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://zajinet.ru/123?utm_term=contact+us+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471092/normal_600b1e5377fd8.pdfIn PDF document text
    • https://cdn.sqhk.co/kafufojugure/fhgJcig/9334302474.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/idjfyqy/31291751860.pdfIn PDF document text
    • https://cdn.sqhk.co/jasojime/idCjfhb/27673554129.pdfIn PDF document text
    • https://komidozikozapuf.weebly.com/uploads/1/3/1/4/131455883/3433958.pdfIn PDF document text
    • https://natozimokuwepef.weebly.com/uploads/1/3/4/3/134398015/06fdc7.pdfIn PDF document text
    • https://retotanenumu.weebly.com/uploads/1/3/4/0/134017544/sagew_fimemabaguvazim_widukukurusu_vimuzutegin.pdfIn PDF document text
    • http://jidagepopisar.22web.org/moropomijosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481163/normal_5fda561fee23a.pdfIn PDF document text
    • http://faketikus.22web.org/tofufevogilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481834/normal_6019730c1f8d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baxaxogi.rf.gd/xavemabatidepupavonevu.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/pokifex.pdfIn PDF document text
    • http://jikorali.rf.gd/english_grammar_worksheets_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/good_marvel_movies_on_disney_plus.pdfIn PDF document text
    • http://gexokaxaxitinug.rf.gd/xinaxazovodufekenesivimiw.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/how_many_calories_in_a_arbys_turkey_gyro.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_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 4888 bytes
SHA-256: cc9bb3d14469b7c4457164f39fb9796f4503b31e3104ea287d2621314d9c8364
font_01_sfnt_off0000fb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 11176 bytes
SHA-256: 0c00955664bc0d08c3fa60e4f61d3d12dba28051458536a300053682d3ffcd8a

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