Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c6f0d2a62e0d18…

MALICIOUS

PDF

73.2 KB Created: 2021-03-03 08:49:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3f367472acfb1146bace0de05331c16c SHA-1: b0b65f223020f1b7176504f85d0e2342e2d36d4c SHA-256: e7c6f0d2a62e0d18d26cda6a6abd95407b1030342ce855ecc2b39d1c65f43a09
214 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier and ClamAV also strongly indicate maliciousness. The embedded URLs point to suspicious domains, suggesting the document's primary purpose is to lure users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/aws?utm_term=how+to+learn+matlab+for+mechanical+engineering In PDF document text
    • http://konalofasu.mywebcommunity.org/lewujowufamugazofaf.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/zirovatikedeguzugi.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/96044094087.pdfIn PDF document text
    • https://biwopotalar.weebly.com/uploads/1/3/1/4/131438783/seratimixisenijido.pdfIn PDF document text
    • http://ludirobus.getenjoyment.net/3596537935.pdfIn PDF document text
    • http://lewuvumo.sportsontheweb.net/nikon_d40_specs.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/icom_ic_2100_service_manual.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/ragejufa/vpn_master_free_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/mesokegemi.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/java_7_update_45_offline_installer.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/48701513298.pdfIn PDF document text
    • https://s3.amazonaws.com/zexozavo/pineapple_pen_unlimited_coins_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/1415089288.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/gavetafumebadukiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/16162906162.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/yearly_xbox_live_free_codes_2019_no_surveys_for_downloads.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/31736691590.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/98381586675.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_off0000e08a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08A 5312 bytes
SHA-256: 264cd6fca7a1909cf45596436e718cc66667c1932d7d3323cfedc95387fd4737
font_01_sfnt_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 10748 bytes
SHA-256: 3800fe6725f4789fc4c19f3246eae1c772a3e1ca90cf77b85294cefc444f1501

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