Malicious PDF — malware analysis report

Static analysis result for SHA-256 26bc07999f662196…

MALICIOUS

PDF

80.0 KB Created: 2021-03-16 11:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 6d6f05366905b1078a860682539b4d98 SHA-1: da44a6a6f8797db060b2dab2654dd97cd9ee836e SHA-256: 26bc07999f6621965fff9649dea88e6a013f12c60c3fb6394017ba1552e9a477
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting a tactic to manipulate search engine results or distribute malicious content. The presence of an external URI pointing to 'crophysi.ru' further supports this. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely related to phishing or malware distribution.

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 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.
  • 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://crophysi.ru/award?keyword=panitikan+ng+pilipinas+pdf PDF link annotation
    • https://ludunijup.weebly.com/uploads/1/3/0/9/130968942/1769714.pdfIn PDF document text
    • http://fapseo.ru/command_prompt_commands_windows_10_cheat_sheetwfs7u.pdfIn PDF document text
    • http://info-pages.ru/bunanotataradifonpeuvb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446285/normal_5fe43b418581c.pdfIn PDF document text
    • https://jinidodax.weebly.com/uploads/1/3/0/9/130969434/8ebbc83eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425909/normal_60405e99d6ff7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407733/normal_5fdbc755c2602.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/guided_sightseeing_tours_new_york.pdfIn PDF document text
    • https://1747caf2-50c5-4ace-8f30-8d3f4e2f7d49.filesusr.com/ugd/017962_5c43e58c8a6544339e466222c1958584.pdf?index=trueIn PDF document text
    • https://75edee45-cd08-43cb-a752-0c33e5c2343f.filesusr.com/ugd/a7c173_f22a08c46a2f4b6ea2cc016ce46d07f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/present_continuous_exercises_with_answers_for_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/98175431786.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/always_with_me_piano_sheet.pdfIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_1bf8ee0838294dc5a57bc65b56861267.pdf?index=trueIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_22ae09b56faf4f23a5f5c729632ef2df.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_f464653379fa4bd7940fdaf721257e8b.pdf?index=trueIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_bf8b20424af3461b9439cdd020883a16.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1F 5180 bytes
SHA-256: f5d0f3c2b95d258add3fd0bef313fbb5c1f229461536fa549e2f1805234d3fa6
font_01_sfnt_off00010ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDB 11524 bytes
SHA-256: 8a491522f8208eb0dea91623e335c004f36bcef7b4c629f998428c9a4f6a3f71

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