Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e44968ee6980ea…

MALICIOUS

PDF

73.7 KB Created: 2021-02-15 22:16:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c98c8c3f82fc7ffe657896333c52eff2 SHA-1: 9082198186e6548c9de56a2378c526baa3090e55 SHA-256: 55e44968ee6980eaf3dc4809dfca2aaa9bdd2fe33bfbce7cb95e5a5b8bf52028
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • 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://baarspo.ru/strik?utm_term=cost+volume+profit+analysis+example+pdf PDF link annotation
    • http://lefefegibilapo.22web.org/brothers_telugu_movie_free.pdfIn PDF document text
    • http://safilow.iblogger.org/ffxiv_botanist_leveling_guide.pdfIn PDF document text
    • http://nout-prodat.site/2017_chevy_malibu_premier_owners_manualh0fuc.pdfIn PDF document text
    • http://llloooodddd.space/hiv_and_aids_education_care_and_counselling_a_multicultural_approach0a82o.pdfIn PDF document text
    • https://vurofagulomefu.weebly.com/uploads/1/3/1/4/131452840/9651797.pdfIn PDF document text
    • http://austritkfa.com/andreas_lettenbichler_husqvarna_wr_3hrupu.pdfIn PDF document text
    • http://mists.space/wheels_on_the_bus_free_video2ecrc.pdfIn PDF document text
    • http://naturaleone.space/letter_format_for_absence_from_workyoarm.pdfIn PDF document text
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/36b24cee7e31.pdfIn PDF document text
    • http://fallofelin.online/voice_changer_recorder_app_apknlp54.pdfIn PDF document text
    • https://fidifeso.weebly.com/uploads/1/3/1/4/131408027/jonut.pdfIn PDF document text
    • http://basiditdcf.space/25824909470qc5s1.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/284916.pdfIn PDF document text
    • http://sushibara.net/dorabudiwiletuzoxulubuzewsyyxx.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/dusined/52651823555.pdfIn PDF document text
    • http://karatufi.epizy.com/davis_drug_guide_fifteenth_edition_apa_citation.pdfIn PDF document text
    • http://walogoke.epizy.com/powerpoint_2013_design_themes_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/sample_email_requesting_information_about_a_product.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_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 5324 bytes
SHA-256: b2f09b3e41aedd7508469a45bcc81fb2b1a42da3b1206e2a87899afb85c3fccf
font_01_sfnt_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 12076 bytes
SHA-256: 04eb4c343a7dc0b690241f3cfd8e963372cdf05214fd53ed8606c0c58c563586

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