Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef89e08ca852008…

MALICIOUS

PDF

78.6 KB Created: 2021-03-27 17:33:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 35344a66458985ef4eb176eb20ccba06 SHA-1: ef672cfb42cff8014c18cd4cc8a332e49b41376e SHA-256: 8ef89e08ca8520081945d48a5320ce8d9ac0d594cd87e28c3bad040a7f32537f
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URLs, including one with a 'utm_term' parameter suggesting tracking, supports the attack pattern of luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/123?utm_term=frayer+model+template+microsoft+word PDF link annotation
    • https://cdn.sqhk.co/xubipoxeguza/ngeijhi/galuravexapagagalemonobu.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/Dgfiggi/likebupejadapusixu.pdfIn PDF document text
    • https://cdn.sqhk.co/xamapetarel/TENgdiC/mukipovoraretifezamol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_600b59563f26c.pdfIn PDF document text
    • https://sulakupewub.weebly.com/uploads/1/3/1/0/131070695/zuvajurupon_purufizonejeb_zerime.pdfIn PDF document text
    • https://cdn.sqhk.co/ragebobeb/eghijie/plants_vs_zombies_garden_warfare_2_online_gameplay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446489/normal_5fcb6ae9bcae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451752/normal_6033aa5669941.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_602fc1c13a2de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490528/normal_5ff15f2ad77c7.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/cghjhid/nowhere_in_africa_movie_free_online.pdfIn PDF document text
    • https://dupubevanedi.weebly.com/uploads/1/3/4/6/134649007/puruzobewokajefu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_243f230539ff4232a9e4542e7c450812.pdf?index=trueIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_14ada98285274e2abe5ecea81dd01b75.pdf?index=trueIn PDF document text
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_8372ceafe1624965bde869dac4051740.pdf?index=trueIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_f9d7be0fbdcf4e1cbd1e6d4c2d2ea084.pdf?index=trueIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_c3964321f48546f0bc1f4804b174c555.pdf?index=trueIn 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_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 5448 bytes
SHA-256: 7ae9791f2eb94bb04ce196e38e22e82232f8427e6cbc240ae9c0879b43bd081a
font_01_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 10240 bytes
SHA-256: 62539bcfdfbb8ab94a309386be6b24d9317a12356c9ba0e2debf396681cd5ea5