Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76a7872eb19b8cd…

MALICIOUS

PDF

73.5 KB Created: 2021-02-11 08:28:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e5fd407998213d9ea6a59f99da014032 SHA-1: af0f72820a68a97575ab364c852971a15724752f SHA-256: e76a7872eb19b8cd68c79cf468a8a5450f8eac34aa0b95b9dd5a523b1444d5e5
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier output strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'cover sheet format example', likely to entice users to click the embedded links.

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 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/wb?keyword=cover%20sheet%20format%20example In PDF document text
    • http://pegiwikepideke.iblogger.org/vejimiwonijipipunizuna.pdfIn PDF document text
    • http://dusosax.66ghz.com/total_war_warhammer_helman_ghorst_guide.pdfIn PDF document text
    • http://pupofikavize.iblogger.org/gobizo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495393/normal_5fdfc187bc7ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463559/normal_5fd88479a8ae9.pdfIn PDF document text
    • http://zujonatuvetivux.iblogger.org/jijamivajotuja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377679/normal_5fcc2e3a54b01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_600fa6f574901.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448328/normal_5ffcadfc48d4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386084/normal_600dcdc13ac41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://magivaxinel.rf.gd/50969561624.pdfIn PDF document text
    • http://nufufud.epizy.com/ligaladirolovi.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/formal_dresses_brisbane_south.pdfIn PDF document text
    • http://rizibapuzaduxe.epizy.com/free_driver_asus_x441u_windows_10.pdfIn PDF document text
    • http://posazexemonepen.rf.gd/la_verne_ca_restaurant_guide.pdfIn PDF document text
    • http://desetezovadu.epizy.com/73278346161.pdfIn PDF document text
    • http://paxovabaresubal.rf.gd/7924980874.pdfIn PDF document text
    • http://fekerudosepu.rf.gd/95805307916.pdfIn PDF document text
    • http://xoviketi.epizy.com/touch_vpn_for_windows_7.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_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 5172 bytes
SHA-256: 7f1a792dc9ef8bb91436c3faff58d6ce24db972e166c31a724976acd64c63786
font_01_sfnt_off0000f47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47A 10744 bytes
SHA-256: 080113dbdaf1e7c89b41ebcbbaaec1d9efa19d35c627bf4d8cb0b4579a023fc3

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