Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f900740f334a74…

MALICIOUS

PDF

68.0 KB Created: 2021-02-09 12:21:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: ee5fe9052d5eacbf4b65e3f2033a3b0e SHA-1: c0b70dd5dd7415a8a37b4f2448fd4bf88786d7e6 SHA-256: 64f900740f334a74affb18309bfab2291ded38a89532e79ce477fc6474121eda
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The document body is heavily obfuscated and unreadable, but the presence of numerous links suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

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=chateauform%20vall%C3%A9e%20de%20chevreuse In PDF document text
    • http://arfeshome.com/167804720060wahq.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/iyjgjid/81674166528.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/gghqhjO/15611195312.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/fFmDmif/7094937074.pdfIn PDF document text
    • https://cdn.sqhk.co/miropefaneka/htspSCg/63571952330.pdfIn PDF document text
    • https://cdn.sqhk.co/vaminika/2JTqfaP/centurylink_email_app.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/jepiagh/reaper_pepper_scoville_scale.pdfIn PDF document text
    • http://drive4mclaneeffingham.com/bibokawekenodofomudtgqr.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/0jijcEK/10401217856.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kipamorilezux.epizy.com/mazavifozugef.pdfIn PDF document text
    • http://purevaxa.epizy.com/96823084958.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/51146521992.pdfIn PDF document text
    • http://sufapasikan.epizy.com/distance_learning_reading_answers_mini_ielts.pdfIn PDF document text
    • http://zoninenawumu.epizy.com/fikot.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/scroll_template_word.pdfIn PDF document text
    • http://sabukizazuse.epizy.com/88804865695.pdfIn PDF document text
    • http://nupituf.epizy.com/burakup.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_off0000c8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FC 5368 bytes
SHA-256: ab09040236d14eefb1be45f2c69a50bdc490bc255384ac2f5d29c28c0c7b8d04
font_01_sfnt_off0000dad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD4 11992 bytes
SHA-256: c5e426453ee33a57cc2cdc6d8307090a5c6abf02e7ae9b380cd0756b87c253e5

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