Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c17f4d046eb0050…

MALICIOUS

PDF

94.5 KB Created: 2021-02-26 14:29:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a5ffae1d085a9feb193362fce4023d2b SHA-1: 708805ee69652043f3013e996e2574cd3c41450b SHA-256: 0c17f4d046eb005047ba16dbc000815c66701fdb925e9effd9b1363de8b1b919
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one identified as a malicious redirector. The heuristic firings indicate the document is designed to link to external, potentially harmful content. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://yafferge.ru/strik?utm_term=ejemplo+de+monografia+apa In PDF document text
    • https://rawoxozuk.weebly.com/uploads/1/3/2/6/132695352/570207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412895/normal_5ff928ff8716b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387698/normal_5fd077f3656d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470029/normal_60137119eff7c.pdfIn PDF document text
    • https://murozukuzofapu.weebly.com/uploads/1/3/4/7/134716639/dasorirewul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495246/normal_5fc5e77be41eb.pdfIn PDF document text
    • https://safuziketuxoxu.weebly.com/uploads/1/3/0/8/130814855/fofalidiruledugikaz.pdfIn PDF document text
    • https://raxelapanaf.weebly.com/uploads/1/3/4/7/134746791/85cd7abc7.pdfIn PDF document text
    • http://jegotaraxipux.iblogger.org/aquinas_college_tauranga_uniform.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xibobok.rf.gd/beat_saber_igg.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/b._d._e_full_form.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/batman_killing_joke_4k_review.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/jogejagesepewojakav.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/xuzadasudobavujowejig.pdfIn PDF document text
    • http://jatoxat.atwebpages.com/whirlpool_french_door_refrigerator_not_making_ice.pdfIn PDF document text
    • http://guvipum.epizy.com/tivabubivugiwuve.pdfIn PDF document text
    • http://fafezevasuba.rf.gd/why_is_my_vacuum_cleaner_not_picking_up.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAF 4924 bytes
SHA-256: 33a31996e1ca3e87bb554c55827f1be22dd5902cd611a4526054ee833d180c15
font_01_sfnt_off00011f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5D 12672 bytes
SHA-256: 0ba5510cc252f42ee52bdd2eb5dd2b29479060668e3ccab0fbb22ae060a24fa3
font_02_sfnt_off000147be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BE 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501
font_03_sfnt_off00015cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEC 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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