Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38f8bfccb7fcb80…

MALICIOUS

PDF

83.8 KB Created: 2021-01-27 14:18:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 84975d6091361abfbae755aa88cca85a SHA-1: c8c15d71c96694b4f7146e7e7cb4411129b2dc2d SHA-256: b38f8bfccb7fcb80a66607065799bdbb629b2c9be6d47d98783890018ed2579c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wb?keyword=proxima%20centauri%20b%20gravity PDF link annotation
    • https://dasibovuripuxub.weebly.com/uploads/1/3/4/8/134860981/52d3ced1b4.pdfIn PDF document text
    • https://tudaluvakagovax.weebly.com/uploads/1/3/4/6/134614365/bemopador.pdfIn PDF document text
    • https://milanabez.weebly.com/uploads/1/3/2/6/132695465/fdf133fb3d.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/k9wligk/shadow_battle_2._2_hacked_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375093/normal_60035dfbbccc5.pdfIn PDF document text
    • http://mumadefiku.iblogger.org/accepting_resignation_letter_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501374/normal_5ffcfab572c38.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/ZmDii6a/61494657279.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/heaiejc/34592666074.pdfIn PDF document text
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/kufasapep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385004/normal_5fe3a371a748f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489725/normal_5fe25a56a67b7.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/hegjGVd/zozowevumifududorekeg.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/nofipid_wokuxasiwimez.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/jidk4jj/36521748904.pdfIn PDF document text
    • http://kekisire.22web.org/dalixup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/muxegeza/galapatasitamexojugef.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/electron_reactjs_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/signatory_authority_letter_format.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/13669435069.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/possessive_apostrophe_worksheet_with_answers.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_off0000fb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB60 5164 bytes
SHA-256: 5e097b6a9f795e9b62c23e789e65fa2144baef67e5d0c769753c5755c1fcabc8
font_01_sfnt_off00010ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 11520 bytes
SHA-256: c87b75b0175a8f57fdb979af4edab586171526b3e12c22018734a84bfc94af14
font_02_sfnt_off000133fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133FB 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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