Malicious PDF — malware analysis report

Static analysis result for SHA-256 4257008504a88681…

MALICIOUS

PDF

78.2 KB Created: 2021-03-31 16:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c37bd7a208bfca6d3f1d65b8169f1f2f SHA-1: 0ee64a76d77092e84932a09f5c26d26fbb9e76fb SHA-256: 4257008504a88681f461e7718da91f2636361071a217978bc5cdbc3aeebd2065
184 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by multiple heuristics and an ML classifier, indicating it is likely a phishing or malware delivery attempt. It contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://dafemum.ru/award?keyword=basic+parliamentary+procedure+pdf'. The document's structure and embedded links suggest it is designed to trick users into visiting a malicious site, potentially to download further malware or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/award?keyword=basic+parliamentary+procedure+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4367668/normal_5ffd44bd4f2af.pdfIn PDF document text
    • https://luludosob.weebly.com/uploads/1/3/4/7/134703274/rizejunuzotife_jafibugogotiget.pdfIn PDF document text
    • https://tujemodi.weebly.com/uploads/1/3/5/3/135301643/dipotogu.pdfIn PDF document text
    • https://nitafigiwulizo.weebly.com/uploads/1/3/1/4/131406945/9bf3fd4e0b.pdfIn PDF document text
    • http://getcreditcheck.info/medical_pharmacology_books_free_downloadv477k.pdfIn PDF document text
    • http://onsideball.info/how_to_calculate_discount_rate_for_cash_flowp1r5c.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/16afc05d82f29.pdfIn PDF document text
    • https://zuwuloju.weebly.com/uploads/1/3/2/6/132681456/c283a839ba24819.pdfIn PDF document text
    • http://steblin.pro/integumentary_system_quiz_and_answersxp1k5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393514/normal_5fe357bf0ecb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456166/normal_5fd34eade6911.pdfIn PDF document text
    • http://doxigedugovo.22web.org/20901712350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488842/normal_60125848eb70f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392463/normal_6003798b95f9b.pdfIn PDF document text
    • http://rerikadarax.iblogger.org/tarigejonadivig.pdfIn PDF document text
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/3903023.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/xeponodij/sowavaguwonusuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/79159560916.pdfIn PDF document text
    • http://wufalejopasedor.epizy.com/principles_life_and_work_review.pdfIn PDF document text
    • http://gunuguduwurenog.epizy.com/ginudi.pdfIn PDF document text
    • http://roranirit.epizy.com/73240421918.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/sitovedopenozegute.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/fexoxuwonibijusasixemag.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_off0000f5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AD 5452 bytes
SHA-256: 076b10ab0d26902856ad00ab0899d7f06cf7ba31c65acdcffbf7761c1d8bc722
font_01_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 10340 bytes
SHA-256: 6fd5171c1111c7b8f5afbe6cd70300a668549c018149b552fb5036fc514a77d7