Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b0705df5a20249…

MALICIOUS

PDF

80.4 KB Created: 2021-03-14 19:53:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: deb54c01e58814c97ba97d0e39fb7aa6 SHA-1: a268a9fac35d0717a53267e1d5cd15272565e7ec SHA-256: 81b0705df5a20249f5d2cd372f7c06ccf06002599f77dd94cd7c972a24c7d834
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the primary one being a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lead the user to a compromised 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://vilenefex.ru/award?keyword=lista+de+intercambios+de+alimentos+para+diabeticos+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474980/normal_604776c98ade4.pdfIn PDF document text
    • http://fomijegi.mypressonline.com/what_is_body_armor_lyte.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386613/normal_5ff8124ce47e5.pdfIn PDF document text
    • https://wezawelo.weebly.com/uploads/1/3/0/8/130813956/607011.pdfIn PDF document text
    • https://kotogafisix.weebly.com/uploads/1/3/0/7/130740127/d9abfb14f97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421787/normal_602e2a3185080.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377679/normal_5febf7fe5a61e.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/rorogafogajip.pdfIn PDF document text
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/cbbc04aa36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378846/normal_5ff942ddf3a5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418972/normal_60286ffca20a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_602d24dcc055f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471481/normal_5fc5bdc16a345.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lexojowal.epizy.com/fabokaxix.pdfIn PDF document text
    • http://gakilasefit.myartsonline.com/18066847616.pdfIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/8332746709.pdfIn PDF document text
    • http://nirirojigupe.epizy.com/44497525479.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/be_like_bro_meme_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/very_nice_whatsapp_status.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/aambala_tamil_songs_starmusiq.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_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 3564 bytes
SHA-256: a8fd1e15d3130d14081cb033f7424123ee08e5003d70bf59318a72fe5916729e
font_01_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 5384 bytes
SHA-256: 17b70cbc9bf308f9b9f120e7422abe400dd4e6c68276eb3d2c3af9bec1360f4d
font_02_sfnt_off00010a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 12384 bytes
SHA-256: 4ce68f048e002e4438fe2c7247379279195b99f26f955f6313f48da14503f5fa

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