Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4b8d7a0285d027…

MALICIOUS

PDF

76.2 KB Created: 2021-02-24 10:54:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1809fa54fed93fc5a65c5a9eb0d623b9 SHA-1: ecfccd5fc56f7d678e005ab4f8c75fab31f92f59 SHA-256: 2a4b8d7a0285d02794cfa3d148fce53d154b4a9a5972d7e5764cc99b81b4c1c7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://druttle.ru/strik?utm_term=que+es+el+genero+literario+narrativo PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489404/normal_5fc5fce56595c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496602/normal_5ffe10d14efef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_60109429e86e5.pdfIn PDF document text
    • http://dektesheff.xyz/4_pics_1_word_6_letters_red_carpetvm7j5.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/HjiPicy/famozifupoteminujoroxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444638/normal_5feaf61f7cfb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_5fe7e939b58e8.pdfIn PDF document text
    • http://premial.su/nuzanivijagib27y77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406812/normal_600174689cd47.pdfIn PDF document text
    • http://domensita.fun/minegajugonomesatelaweh6dvd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481834/normal_5fe66a2708fb6.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/WnhcC4x/ecology_ka_meaning_in_urdu.pdfIn PDF document text
    • http://frut-tree.site/directions_for_using_splat_hair_dye7qasm.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/vapelurowar/you_just_want_attention_lyrics_video.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/how_much_do_construction_managers_make_in_california.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/74502116614.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_off0000deae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAE 4856 bytes
SHA-256: c3872dc62400264cd777738ef6fb8893f8347186a8293c256d23b81ca9f7d9d7
font_01_sfnt_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 11320 bytes
SHA-256: 1f437c7abc6149a3b519b30da5798ca3b8924982ee5864e53dbfb6a584ef3073
font_02_sfnt_off000113e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E7 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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