Malicious PDF — malware analysis report

Static analysis result for SHA-256 305be4d9955f6566…

MALICIOUS

PDF

76.9 KB Created: 2021-02-08 06:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b0a08cb2ee663c008afd6a41fd6be19c SHA-1: 042cea0eeb578121dae5ce51754f57e89aba3684 SHA-256: 305be4d9955f6566e00289844e2223ecf9312721fa32a60caea664a651df4ed4
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to known malicious redirectors and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

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
  • 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 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.
  • 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/aws?utm_term=article+format+class+9th In PDF document text
    • https://cdn.sqhk.co/kavonalitego/jhhakgf/data_flow_diagram_software_free_download_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/ooHjbN2/45394878626.pdfIn PDF document text
    • http://hamlikjorettoop.ru/vunuxoxe5ho0w.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/ih8ggdX/download_battlevoid_classic_full.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_601a7d9270f34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530151/normal_5fd3b1558063c.pdfIn PDF document text
    • http://xitigedomure.66ghz.com/pirates_of_the_caribbean_movierulz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477635/normal_600a7147d275c.pdfIn PDF document text
    • http://hurleyshamburgers.com/calendario_2020_por_mes_para_imprimir_gratis76c1n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_601d436c7e518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407781/normal_601d84e63d1aa.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/gfgc4Wd/gioco_dama_online_con_amici.pdfIn PDF document text
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/rotama_xupen_xedatozox.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/5ed010R/zikirufanoruse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kituvofaxur.epizy.com/bteup_date_sheet_2019_special_back_paper.pdfIn PDF document text
    • http://jabaxuzadowepep.rf.gd/jajefizonodamugi.pdfIn PDF document text
    • http://wefefamerimido.rf.gd/15281119434.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_off0000f0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E8 5264 bytes
SHA-256: 790254e9be951d9bb1215710b0691c167b21627eb534c130186e64335a64b540
font_01_sfnt_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 10652 bytes
SHA-256: 73527b74ec35bf502274d60fceaa1db46980f500bd04b7c382e6f841320345b6

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