Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3caffd6a838dbed…

MALICIOUS

PDF

79.2 KB Created: 2021-05-11 05:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6a0de2393d6d814162c8fef69422fbd9 SHA-1: 291dcb12f4255302336a705a3a7f999a5e885529 SHA-256: a3caffd6a838dbed4a59835554941f8c8f29c0439facdefe9e9f08f5e65d60ba
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'apple and orange joke' and 'wkhtmltopdf', suggesting a lure to a malicious site.

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://seumenha.ru/strik?utm_term=difference+between+apple+and+orange+joke PDF link annotation
    • http://jukojadijomefar.medianewsonline.com/active_and_passive_voice_simple_present_tense_worksheets.pdfIn PDF document text
    • http://vatamuvemazaril.sportsontheweb.net/creative_problem_solving_an_introduction.pdfIn PDF document text
    • http://1xbets-regs.site/mudumojidudevavbf1m.pdfIn PDF document text
    • http://pshcomonhere.xyz/sinizubaligc4r8.pdfIn PDF document text
    • http://redpandarecycling.com/spanish_grammar_tenses_chart6225z.pdfIn PDF document text
    • http://boxberry-24.cc/rafefonedht69.pdfIn PDF document text
    • http://chaptejvxz.fun/lepotijixesozekalebenm4jh8.pdfIn PDF document text
    • http://e-sparks.ru/how_to_summoning_jutsu82qf4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_b72e509421e14c0aa2faaf4b7b384370.pdf?index=trueIn PDF document text
    • http://vutogebufuz.myartsonline.com/hallelujah_anyhow_chords.pdfIn PDF document text
    • http://gemovimuwopete.atwebpages.com/1481304539.pdfIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_be1d836669fb4d34aa9dd7c3d164d1b0.pdf?index=trueIn PDF document text
    • https://c534e673-b245-4a6d-8787-855fe96db707.filesusr.com/ugd/e19215_854d6984f01c4521926c0a980ae0b9f5.pdf?index=trueIn PDF document text
    • https://f171294f-ed7a-4884-a773-1e826a512430.filesusr.com/ugd/20d861_d431bec610f44ba8a2ec90c98daadc12.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/is_the_honest_company_baby_shampoo_safe.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/21079063776.pdfIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_cc8f02bd18b64ca29704b49bc5bcd855.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuniku/b_w_companion_hitch_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/71009112306.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/55325307894.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 5516 bytes
SHA-256: 4a4eb69b44459632f0e3c7631353efe84675da77b72d3dc25ceea01fab4c7af6
font_01_sfnt_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0001086a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 10836 bytes
SHA-256: 5528f1d58d339a71275f9a15834552231d64b9252642aea7d2cde9dc3214401b

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