Malicious PDF — malware analysis report

Static analysis result for SHA-256 873e3de74b0440c3…

MALICIOUS

PDF

67.8 KB Created: 2021-03-09 07:56:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 11ad2b1cbeaa4ca04ca64c8a04df859e SHA-1: b8df3ca74e72429ff8323db1639f62180303d45f SHA-256: 873e3de74b0440c368bfbdf27a1cbf226005ef30bce0dd12cf8d07f32b18b5e5
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic findings point towards a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/wix?keyword=climograph+worksheet+garrett+geography+key PDF link annotation
    • https://rofexelugikovu.weebly.com/uploads/1/3/4/7/134732340/girabupiwoka.pdfIn PDF document text
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/6943288.pdfIn PDF document text
    • http://daniele.store/kms_activator_filehippozxt51.pdfIn PDF document text
    • https://zedazepofa.weebly.com/uploads/1/3/0/9/130969939/kavupodefepewuri.pdfIn PDF document text
    • http://storeeuro.info/gabebulusopiviyeiyl.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/jubojekibewu.pdfIn PDF document text
    • https://xemavuvewo.weebly.com/uploads/1/3/5/3/135394060/62a84301d048.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/52ae8f4a-b31a-436f-8690-823d788d3688/what_are_the_methods_of_teaching_language.pdfIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/roy_baumeister_willpower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642e437b-3dc0-4d58-a3af-7d1de55a32c4/14471758714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/055bff49-169a-432a-99c4-191282127f04/libro_de_lecturas_primer_grado_1993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e1fadd-9dcc-45fb-ab35-92b61204b77c/sir_gawain_and_the_green_knight_movie_1991.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/35613016246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f880ee-8848-48c0-8f57-d5c553f728cc/clases_de_ingles_gratis_para_adultos_en_houston_tx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/614a0fae-7eed-4553-bcb8-6eb5172dd87f/romeo_y_julieta_churchill_cuban.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_off0000cd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0F 5396 bytes
SHA-256: 5b6fc29e8c4da08845fcb9c99ed8c88f8213015367bf064f8884b678a54050cf
font_01_sfnt_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 10104 bytes
SHA-256: cef64188835724577d55ef2fdccf7dd8271c7fba0cbac9534aae582efa9cfae4

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