Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c86b2fa7ec6e52…

MALICIOUS

PDF

67.3 KB Created: 2021-02-09 19:31:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 8bdc951a70c17619142464f169e9df36 SHA-1: 5871015e50df99b374e0127be702d8caaa9bc9c1 SHA-256: c1c86b2fa7ec6e529def407309b927ffced0c7e8555ce2b22d5aa706c307ab4c
184 Risk Score

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
  • 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=quality+control+resume+download In PDF document text
    • https://cdn.sqhk.co/sinemajud/hjKicFL/siberian_husky_german_shepherd_mix.pdfIn PDF document text
    • https://cdn.sqhk.co/judawube/hajPmif/41011143654.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391302/normal_5fe5599d211d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_5fefde75e1232.pdfIn PDF document text
    • http://osummer.space/movie_in_the_heat_of_the_night_trailerv0qv8.pdfIn PDF document text
    • http://redtea.space/92616493772a7q2f.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/zulezov/japanese_verb_conjugation_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/pesejupu.pdfIn PDF document text
    • http://legofovivaxom.epizy.com/zodubojefip.pdfIn PDF document text
    • http://pebulibupa.rf.gd/browns_injury_report_week_2.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/66971157900.pdfIn PDF document text
    • http://sowawobajomo.rf.gd/xekimewunujew.pdfIn PDF document text
    • http://jofawapedoguw.rf.gd/drylin_linear_guide_system.pdfIn PDF document text
    • http://tulupewovevola.rf.gd/62719962894.pdfIn PDF document text
    • http://rusogiwelak.rf.gd/golizoxalubuded.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_off0000cb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB85 5340 bytes
SHA-256: 4cec14b36db2ff79c998eaab2c0eeafb7ffbf257b3fb446f52382b9356461860
font_01_sfnt_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 10176 bytes
SHA-256: aee1daae7e0c7d8d462bb85290001ea717731f961c1de064407f8e84c231e516