Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c5239143476131…

MALICIOUS

PDF

80.4 KB Created: 2021-03-03 20:57:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5505080b960bf3f43c8d8522014fef16 SHA-1: 6992fba74a77cb508cc4fb9958f2bcf0b4734df9 SHA-256: f8c5239143476131c6b24325e4a6d20db2fe5b07507f1b1d43a99d61636c8a3d
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a redirector link to known malicious infrastructure. The embedded links, such as 'https://crophysi.ru/123?utm_term=dialectic+of+enlightenment+summary', are designed to lead users to potentially harmful content. The file's structure and numerous links suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/123?utm_term=dialectic+of+enlightenment+summary In PDF document text
    • http://creditreportusa.info/strong_curves_bodyweight_workout18k6w.pdfIn PDF document text
    • http://wodedutipif.medianewsonline.com/7822409018.pdfIn PDF document text
    • https://xaxarudo.weebly.com/uploads/1/3/0/7/130740130/8a55035.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366654/normal_602f61e36fdb6.pdfIn PDF document text
    • http://tujidal.mypressonline.com/computer_system_engineer_architect_job_description.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446151/normal_6035ef769514e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392873/normal_5fe5175e92433.pdfIn PDF document text
    • http://luminar4-download.xyz/fobibukezufusinubokubukk4iex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404757/normal_60253b71315e9.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/dyson_cinetic_big_ball_animal_vacuum_assembly.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/how_did_9_11_affect_the_us.pdfIn PDF document text
    • http://leledup.mypressonline.com/vizio_e601i-a3_apps.pdfIn PDF document text
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/b6e149816646e.pdfIn PDF document text
    • http://zahlungsservice-ch.site/406126414759jn1e.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/bujezova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482413/normal_60308dbb727b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 5396 bytes
SHA-256: 06ca8a4cc5228f287e81132ac45f124a74dd30639c4095bb2ec36eb919aa7400
font_01_sfnt_off00010e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E51 11052 bytes
SHA-256: e5374bc37b5a6e032a8cd1f9528b74ed86248c1a9e1f02e1c6c494c9cb25874b

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