Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ebc0217ce550fc…

MALICIOUS

PDF

80.2 KB Created: 2021-03-25 05:27:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2b5c3405848cfe9251c424b739e80377 SHA-1: ed7c5527b86ef2440c8285d00d135fa2ffbfa4ee SHA-256: b7ebc0217ce550fc7854f6e859ba6084ae8206240a3d636014850f2fea597fbe
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The presence of `utm_term` parameters in some URLs further indicates tracking or redirection for malicious purposes.

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/strik?utm_term=zao+shang+hao+meaning+in+mandarin PDF link annotation
    • https://pelefazefipaguj.weebly.com/uploads/1/3/4/8/134892892/9076092.pdfIn PDF document text
    • http://kevifiregerufug.scienceontheweb.net/dufegetotazenexutosabiton.pdfIn PDF document text
    • http://koxelovanalimu.getenjoyment.net/.pdfIn PDF document text
    • http://tehnotop.site/828812110673k6n.pdfIn PDF document text
    • https://pubotaxo.weebly.com/uploads/1/3/5/9/135962756/lakipadal.pdfIn PDF document text
    • http://lalabomujulimof.mywebcommunity.org/is_chick_fil_a_chicken_healthy.pdfIn PDF document text
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/duveduzuwefoba.pdfIn PDF document text
    • http://vizenam.medianewsonline.com/makkar_ielts_speaking_cue_cards_september_to_december_2020.pdfIn PDF document text
    • http://g2am2e.xyz/stephen_bigalow_candlestick4y1r3.pdfIn PDF document text
    • http://pakizimavom.scienceontheweb.net/bible_history_timeline_chart.pdfIn PDF document text
    • http://nukapag.getenjoyment.net/akbar_birbal_story_book_in_marathi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d892855-45ea-4179-955c-c49fbd4f9908/18648906046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e6bed7-72d4-41fc-b7e1-582f4ee8350a/pulobuguvo.pdfIn PDF document text
    • http://zokaramizixa.atwebpages.com/algebra_1_worksheets_with_answer_key.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_93a726fee40a4c68a4bef069bc1f6342.pdf?index=trueIn PDF document text
    • https://321e46d8-a3e9-4523-905f-b0dcd1dcb7ef.filesusr.com/ugd/29fbc3_768aa2df20234ee2b5643f430acc2a07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4b116d2-b7f0-44b1-b997-784902b4c0f2/bose_acoustimass_15_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e3bf8c7-a383-47e4-ba2f-80bcc5cc9958/gerasoniruwivesadigeme.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_off0000ea20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA20 3992 bytes
SHA-256: 7a2937ed2f03699e95d599aba19add1cd2d791b2bdb77f8c78c9c0ffc85d78be
font_01_sfnt_off0000f843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF843 5164 bytes
SHA-256: bf663dc35ea07e6872f58cf375cd8992f67919722e0049230b498bada3b1b147
font_02_sfnt_off000109a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A5 12520 bytes
SHA-256: e3d064fcdc1e94774e2dbb5e76435db5e7faf93d1f49bc5050c22c39b1167136

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