Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fdef63c312821e1…

MALICIOUS

PDF

129.5 KB Created: 2021-04-08 07:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 66ec847708e840ca7cfc7ae010e32fa2 SHA-1: 8637059fff1727127682da199efe27e32b9c08c8 SHA-256: 8fdef63c312821e15ce5721dd966bbfab9115e3483817648cdbc3a5d1087b838
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The document body is heavily obfuscated, but the presence of numerous links, many pointing to disposable hosting and utilizing UTM parameters, strongly suggests a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself facilitates redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=oracle+database+sql+reference+manual In PDF document text
    • http://20970907.net/lactinex_davis_drug_guidepfsw1.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/atgf69T/91366598143.pdfIn PDF document text
    • http://future-techno.ru/88025494373p2xs3.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/ii2DfSg/rimisaxabuzataferipatide.pdfIn PDF document text
    • http://solapp.xyz/how_bad_do_ws_look_on_your_transcriptpnmwd.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/hbvicjc/60451297300.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/batoragubukepo/what_are_the_3_rivers_in_pittsburgh_pa.pdfIn PDF document text
    • http://robogotut.epizy.com/azamara_journey_deck_plan.pdfIn PDF document text
    • http://gexovudin.rf.gd/revista_eudora_ciclo_6.pdfIn PDF document text
    • http://tinanatibora.rf.gd/gibukofisaroperoz.pdfIn PDF document text
    • http://zuniguvip.epizy.com/queen_bed_sheets_walmart_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f479fc09-99ce-4f0f-8b4f-7325c55d3fe7/17346450794.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/mandated_reporter_pa_childline.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/nibivifilegovabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3846a7df-c20d-43e7-a5b5-4db260099dfc/biblia_de_jerusalen_en_linea_en_espaol.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_off0001bcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCC6 5460 bytes
SHA-256: a18fedb0a8e5f7ecdbf32a83c2a8435b25f3da958ba7bf3907886300a4b048b0
font_01_sfnt_off0001cf33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF33 12260 bytes
SHA-256: 315de3a931a0dc8bda51e084c061987c7d3df1c001173056561444726a0d4fed

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