Malicious PDF — malware analysis report

Static analysis result for SHA-256 337c0458acfcf78b…

MALICIOUS

PDF

70.3 KB Created: 2021-05-28 10:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c932366c2368460a1f88b2f400ba589a SHA-1: 5a52bcb892fe667202e3e975908a53ece4a4b59f SHA-256: 337c0458acfcf78b434d703eb7231929ab97ede2e3278cb0ad18cfd22aae35d0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/strik?utm_term=christ+is+risen+matt+maher+chords PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414353/normal_5fcc3d21f0cd3.pdfIn PDF document text
    • https://womurozini.weebly.com/uploads/1/3/4/5/134507066/tanadotop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468554/normal_5ffbce9786546.pdfIn PDF document text
    • https://fotapudugibinok.weebly.com/uploads/1/3/4/8/134899903/zozejodogal.pdfIn PDF document text
    • https://vajefusuvujob.weebly.com/uploads/1/3/4/4/134464162/begujixule.pdfIn PDF document text
    • https://tazejoga.weebly.com/uploads/1/3/1/3/131383942/2083550.pdfIn PDF document text
    • https://wejolizamu.weebly.com/uploads/1/3/4/7/134766198/940943.pdfIn PDF document text
    • https://mezobemubuzopos.weebly.com/uploads/1/3/3/9/133997151/godawasulivaweb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_602866fd84738.pdfIn PDF document text
    • https://pananufizusa.weebly.com/uploads/1/3/4/4/134445813/6be3481f1.pdfIn PDF document text
    • https://lojavexir.weebly.com/uploads/1/3/5/9/135963097/nibarabizuxima-vizomuno-begiwotekulafin-datamidubu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393901/normal_6059270fe061e.pdfIn PDF document text
    • https://nusomosuguxapo.weebly.com/uploads/1/3/4/6/134693055/xijikilizuwe.pdfIn PDF document text
    • https://mepuralomelefaz.weebly.com/uploads/1/3/4/4/134494325/b215254be91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496810/normal_5fc5ca05a61f5.pdfIn PDF document text
    • https://zulufiki.weebly.com/uploads/1/3/4/6/134662959/a97432.pdfIn PDF document text
    • https://rojobasexadef.weebly.com/uploads/1/3/2/7/132711954/3038088.pdfIn PDF document text
    • https://bawimadesudife.weebly.com/uploads/1/3/4/3/134363746/4777708.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/02104ce7-6392-4bef-8c56-5cde3f1fd8b8/cuadernillos_de_trabajo_para_primer_grado_de_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9d5339-2142-491a-abad-940e09860785/how_to_not_be_codependent_book.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46C 5052 bytes
SHA-256: a5b62db7c75233d320d79a9b412249a56f16591b75ba45983958c00edf5ecd02
font_01_sfnt_off0000e55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55C 10968 bytes
SHA-256: b4e21dcd305e31da3c5f5985877e99a1c04932bb103a17cfac7f5d9f207e7e77

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