Malicious PDF — malware analysis report

Static analysis result for SHA-256 c33f2e92653859b3…

MALICIOUS

PDF

77.9 KB Created: 2021-03-17 21:52:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e2fc8fe3459d5372f2572888f327c96a SHA-1: 2365e5d830b4df57890961b1c7e1e08d476b7f22 SHA-256: c33f2e92653859b39d3135369014c5ca5ab3f891c1e0fccee173b468a62ec9ff
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. This is strongly indicative of SEO manipulation or a distribution mechanism for further malicious content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://vilenefex.ru/award?keyword=bwv+1001+fugue+guitar+pdf PDF link annotation
    • https://xivamiwilazux.weebly.com/uploads/1/3/4/7/134742933/lolitijaxatopeg.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/cf0f28.pdfIn PDF document text
    • https://badosajag.weebly.com/uploads/1/3/1/4/131407507/rutowexuzorizapezowo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_604324193a730.pdfIn PDF document text
    • https://purigimotefejis.weebly.com/uploads/1/3/4/3/134308192/69345.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/33319170152.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425533/normal_604d0f3f3d460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466398/normal_5fd123f58e770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449776/normal_600bfd7a52cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484605/normal_5feaf39f43edf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tefetuzuzip.myartsonline.com/76038468653.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/41690647863.pdfIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_c1051d2f8216479aaa137b14eabf3f62.pdf?index=trueIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_7d3c2958b24245dfa4f8aa5bc83ed656.pdf?index=trueIn PDF document text
    • https://1628ddcf-e301-416d-9649-d9339b85441b.filesusr.com/ugd/0b1079_bfdc792bfdf946568e5f12758d9b5a33.pdf?index=trueIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_c11eb1944b5e4704925f8ff99f63cc12.pdf?index=trueIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_0d2ce3548bba4fbeb4a063b2baa79d77.pdf?index=trueIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_175016a3b58f40a397fef77ea1f07014.pdf?index=trueIn PDF document text
    • http://kozogasivufi.myartsonline.com/where_do_you_buy_check_registers.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_9935e4bda14a4ab58e0494310794b2cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/248999c3-cc9a-408a-abb6-80f03fa9a9b9/49015578891.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_2fe5ec25b6684583ae7ed1cb4109d2ce.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_991311144a75439e8f7e2eda03727714.pdf?index=trueIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_e759a348050b410aae55b0f73973c2e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d92c904-37f8-4e03-9a9f-c8509bd86ac6/54658355474.pdfIn PDF document text
    • http://lolunoxij.myartsonline.com/imperative_exercises_multiple_choice.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_off0000f438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF438 5396 bytes
SHA-256: 711f9ecbf422cb9fbc68a04ccab9b00ad4d892604d60ee5c16a5c0e9d6b4d068
font_01_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 10268 bytes
SHA-256: 4cb658eca7a269e2e405e41c4701ec15e3e10b7800e5ed9090127ccba3128f53

Open this report in the interactive analyzer, or submit your own file for analysis.