Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbac161ab21376c…

MALICIOUS

PDF

78.5 KB Created: 2021-03-22 08:15:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fb2a44bd35f82dd330bf0f46b22373a3 SHA-1: c9abdd4dc43e3072067e45238d884b845876ac76 SHA-256: afbac161ab21376c13630dde5732b403b1839d51f966b338caf9a93fe5ad6b0f
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or contains malicious content. It hosts a large number of external links, many on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of a 'download' button lure further supports a malicious intent to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/123?utm_term=bodyweight+workout+crossfit+pdf PDF link annotation
    • http://nasufulorejuwe.mywebcommunity.org/vsepr_model.pdfIn PDF document text
    • http://jepenufi.getenjoyment.net/2009_ap_english_language_and_composition_free_response_questions_sample_essays.pdfIn PDF document text
    • http://pugezesiw.mygamesonline.org/malinche_english.pdfIn PDF document text
    • https://fisuzawagowesus.weebly.com/uploads/1/3/1/8/131857314/bakevezi_piben_rubesot_vafen.pdfIn PDF document text
    • https://gopebuxagofu.weebly.com/uploads/1/3/2/6/132681698/rapixuko.pdfIn PDF document text
    • https://girosiwubu.weebly.com/uploads/1/3/0/7/130740458/5045855.pdfIn PDF document text
    • https://kusafowagu.weebly.com/uploads/1/3/1/8/131871480/1836376.pdfIn PDF document text
    • http://lumogodasekepi.mypressonline.com/attitudes_and_motivation_in_second_language_learning_1972.pdfIn PDF document text
    • https://gidupewurugi.weebly.com/uploads/1/3/1/6/131637306/5545409.pdfIn PDF document text
    • http://vukufitu.mywebcommunity.org/bupukevumax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumurulepowele.myartsonline.com/biblia_diaba_chomikuj.pdfIn PDF document text
    • http://kipenul.epizy.com/64771710816.pdfIn PDF document text
    • https://14579757-8399-40ae-9aa0-1c510f02119b.filesusr.com/ugd/5613ee_f8b8d9de1dda400899084be4ab8a6e17.pdf?index=trueIn PDF document text
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_f10f632ce2024997ac5a41202b591c9b.pdf?index=trueIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_5f6807dffbea4a3b86a61da736c2b0b5.pdf?index=trueIn PDF document text
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_38760940ea8b480792f7550dc34cdd93.pdf?index=trueIn PDF document text
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_b8d0be080ca948e4a601a59c6000929b.pdf?index=trueIn PDF document text
    • http://pebomotixot.myartsonline.com/gettysburg_address_download.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/65577066020.pdfIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_71e6aa2ef16f49b6af0273b413d79a12.pdf?index=trueIn PDF document text
    • http://kedukukixef.epizy.com/belewunijawaro.pdfIn PDF document text
    • https://db38eef3-7d65-43a4-badd-ba39ed7d9417.filesusr.com/ugd/bd2483_d9f076c4c30b46b48562f80f198e27c3.pdf?index=trueIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_15228ecab4dc4c7e9f1e34c7ac67f20c.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_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 5480 bytes
SHA-256: 4e1cff76d7a82dee3c0a59b06eab645f88b28c356c5502b18832c050f0591911
font_01_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 10552 bytes
SHA-256: 4acf05907700733f055c7d1e939bbbce5ada7fbf57063505165f4cb61e83c0d0