Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb3cd9cedebba6e…

MALICIOUS

PDF

80.3 KB Created: 2021-02-21 12:16:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4888ac222313873da244404c7ba25272 SHA-1: 1489af5b38121361ff78d9e9d54fd600b5435ef6 SHA-256: bfb3cd9cedebba6e52af584b434cf0427f143ee879a17d67e4e4d30c3486fb12
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

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://baarspo.ru/123?utm_term=blade+chroma+4k+camera+drone+price PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421350/normal_60155fc5d7568.pdfIn PDF document text
    • https://wixilasiniwib.weebly.com/uploads/1/3/1/1/131163505/a2c632b36.pdfIn PDF document text
    • https://nemaxololele.weebly.com/uploads/1/3/5/3/135304154/434fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477864/normal_5fe87f8cc2c68.pdfIn PDF document text
    • http://menedowu.iblogger.org/76036760051.pdfIn PDF document text
    • https://xoxebugifujame.weebly.com/uploads/1/3/4/4/134478015/wizewusigokapotilefa.pdfIn PDF document text
    • https://zibubelufi.weebly.com/uploads/1/3/4/5/134517595/wajilujibosobuj.pdfIn PDF document text
    • http://kivumokaf.22web.org/95116569537.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367947/normal_5fc82782c3bad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455380/normal_5fcdf9d000e45.pdfIn PDF document text
    • https://zigetavut.weebly.com/uploads/1/3/0/8/130814179/730e8d1.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
    • http://wagopof.epizy.com/dynasty_warriors_unleashed_beginners_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/zavap.pdfIn PDF document text
    • http://fujalur.epizy.com/mtabolisme_lipidique.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/fizik_infinito_r1_size_guide.pdfIn PDF document text
    • http://xujijanuzovaziv.rf.gd/goodnight_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/46810043753.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/messenger_for_mac.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_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 5044 bytes
SHA-256: e14bd7b8ce7dfef5e1a48211ef1f9f6b5fe8ed66ebc3fb628ad8ce72b2bbf5f9
font_01_sfnt_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 11160 bytes
SHA-256: 3f64de8451530fae5cd767645e84f4fe4dd5e266ad36875d9aaa38cbe8708a11
font_02_sfnt_off000125f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F6 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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