Malicious PDF — malware analysis report

Static analysis result for SHA-256 945decc3a14a523e…

MALICIOUS

PDF

71.5 KB Created: 2021-02-19 05:31:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d43eb3a7119e692b692126db88b48de6 SHA-1: 6b289e454136136143f851d8d65dacf5450b53c4 SHA-256: 945decc3a14a523efcfb42bc27d047df069ed4d2b28c38bd3de661daa4c99234
186 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, characteristic of a link farm or SEO manipulation scheme. While no scripts were extracted, the PDF structure and numerous external URLs suggest it is designed to redirect users to potentially malicious websites, possibly for phishing or malware distribution.

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
  • 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://seumenha.ru/strik?utm_term=eva+luna+novela+capitulos+completos+gratis PDF link annotation
    • http://pubgmobiie.com/divertida_mente_filme_completo_dublado_utorrentosqi7.pdfIn PDF document text
    • http://retys.fun/solidworks_student_free_trial4r2jf.pdfIn PDF document text
    • http://kraftmann.su/how_to_use_i-pilot_link_with_humminbirdztwlu.pdfIn PDF document text
    • https://bibatajikoxego.weebly.com/uploads/1/3/5/3/135315017/7713830.pdfIn PDF document text
    • https://pixelisikug.weebly.com/uploads/1/3/1/4/131407736/f5145b55ee25.pdfIn PDF document text
    • http://tajoraf.22web.org/89275191794.pdfIn PDF document text
    • http://baugroup.info/dusiwidofexahpknf.pdfIn PDF document text
    • https://kodavagimiwebod.weebly.com/uploads/1/3/5/3/135346487/xopabot.pdfIn PDF document text
    • https://vanoxurele.weebly.com/uploads/1/3/1/6/131606202/3788e4ca8601.pdfIn PDF document text
    • http://health-top.ru/my_lips_are_constantly_dry_and_cracked6ltna.pdfIn PDF document text
    • https://xinewufovina.weebly.com/uploads/1/3/4/2/134235071/tozovule.pdfIn PDF document text
    • http://lukezelulevuf.22web.org/western_unimount_plow_motor.pdfIn PDF document text
    • https://zejoraxiziras.weebly.com/uploads/1/3/5/3/135315695/749d06db.pdfIn PDF document text
    • https://puxorubawi.weebly.com/uploads/1/3/5/3/135349856/kuziwuketez.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/simujix/arm_assembly_language_fundamentals.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/samsung_ml_1865w_printer_wireless_setup.pdfIn PDF document text
    • http://netixoxolasabo.rf.gd/3170640043.pdfIn PDF document text
    • http://gunexukod.epizy.com/alone_dp_image.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/21310057952.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/ielts_writing_task_answer_paper.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_off0000d83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 5268 bytes
SHA-256: 4fc5d3df2eb0fc8d03b0b3f0c2cc9ac5b011b6646f04e20d02f0e799089fcec8
font_01_sfnt_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 11252 bytes
SHA-256: f8553a315971380b0785d6a04689fd67ea9f93d1ad8eda2ab9f0fddb6e49a888

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