Malicious PDF — malware analysis report

Static analysis result for SHA-256 28286c8f438b018c…

MALICIOUS

PDF

76.2 KB Created: 2021-03-14 08:53:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a5c278794453b9e0fcf7d9625073437e SHA-1: 170866a5f99e9b77721eaac4f524873333df21e0 SHA-256: 28286c8f438b018cee767548f417a37d19d785fc9d12f1f107fc25ccb67df3b7
184 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable domains and known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the embedded URLs are the primary indicators of compromise, pointing to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/award?keyword=botanical+names+of+common+plants+pdf In PDF document text
    • http://moshon.space/national_academic_recognition_information_centre_naric1qjib.pdfIn PDF document text
    • http://matawobedopikam.mywebcommunity.org/end_of_the_world_movies_on_hulu_or_netflix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403817/normal_5ffc2c315e27b.pdfIn PDF document text
    • http://libralab.digital/ganopubutogvtjn2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470400/normal_602958f758053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_602814a6d967c.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/loguwovuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_6014a6d9daf50.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/12664886023.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499334/normal_5fc8b3fc3c982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_5fe9f02e12a44.pdfIn PDF document text
    • http://pepesox.22web.org/letivilavelebuxobodakar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_602fd50ac7cd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_6014ccd3e2928.pdfIn PDF document text
    • http://wozupabalaviv.medianewsonline.com/fijozovexavakupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487888/normal_60412e4d8d0a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459054/normal_60175fdbe000b.pdfIn PDF document text
    • http://creditpm.com/nukabizijugomumujgjjrt.pdfIn PDF document text
    • http://gelchlen.fun/szck_trlerizuoti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462352/normal_603954dcee5ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vonupov.epizy.com/peter_pan_original_script.pdfIn PDF document text
    • http://robirevi.epizy.com/aquage_transforming_paste_3._5_oz.pdfIn PDF document text
    • http://runuwug.myartsonline.com/77114010836.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_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 5256 bytes
SHA-256: e3fef1094f24d3b02b0eb76ef38bfa4e05497e31aa8ab484b959daba10ea1065
font_01_sfnt_off0000fcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 11452 bytes
SHA-256: 6749f8e19c567ac52b96c61291c742cc3567fa55a88cff2112680dbc57f6922c

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