Malicious PDF — malware analysis report

Static analysis result for SHA-256 789b8eb52fea12bc…

MALICIOUS

PDF

69.4 KB Created: 2021-01-16 03:28:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3bbd2b933e65b5e89a86b2b8d1bbffa6 SHA-1: 02d0978aa3f1260667a7607ebf3118e4fd6d8efa SHA-256: 789b8eb52fea12bcf2226980448c33a5b1dc0df15f62ca7118d8420e82dc228b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/123?utm_term=the+masks+we+wear+dr+arthur+neuman In PDF document text
    • https://tekoriforeta.weebly.com/uploads/1/3/4/6/134639422/0065b2b9.pdfIn PDF document text
    • https://site-1166725.mozfiles.com/files/1166725/vujizixevuwodoxebatu.pdfIn PDF document text
    • https://jotitotibewava.weebly.com/uploads/1/3/1/3/131383271/povaxezisakeworud.pdfIn PDF document text
    • https://pudijubo.weebly.com/uploads/1/3/4/3/134311311/add41af0.pdfIn PDF document text
    • https://site-1180682.mozfiles.com/files/1180682/starlink_internet_cost_and_speed.pdfIn PDF document text
    • https://xeruwuxopexok.weebly.com/uploads/1/3/4/4/134467304/pukovoz.pdfIn PDF document text
    • https://morutasatosode.weebly.com/uploads/1/3/4/3/134366393/886d5ac754f1bea.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/diit2gj/malay_chickens_for_sale_in_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/sakixowofeg/2QggZgd/51745671182.pdfIn PDF document text
    • https://site-1178403.mozfiles.com/files/1178403/dj_playero_playero_37_canciones.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/wilugugo/31222773645.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/potokidizazetuf.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_off0000d528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD528 5140 bytes
SHA-256: e9101f4fee70d7f01610c44cca4d5868e1b8caaf3dcb3c0f676d6a987d1e393e
font_01_sfnt_off0000e681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE681 10104 bytes
SHA-256: bee27d5017d22461a30d86fb78ab5d83777c901fafecfea139d99815d14b580f

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